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Teaching Old Progs.dat New Tricks.
You know about the info_notnull explosion hack. You know about making monsters drop weapons or alternate ammo using the .weapon and .ammo_whatever hacks. You know about making items float in the air by spawning them on a temporary platform. Let's have a thread where we talk about new ways to use existing behavior and get novel gameplay. If you're a "retired" mapper, this is a great time to do some armchair level design and suggest ideas you'll never have a chance to use yourself.
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Oh And... 
make sure something targets it or else it won't move.

As an extension of this idea, you could have a teleport that changes destination by having it target this entity and giving the 2nd path_corner a wait of -1. 
 
You can teleport to monsters, even dead ones. :) 
And Items 
 
Fiends Hatching From Grunts 
So you give a grunt 'effects 8' and when he dies, he trigger spawns a fiend into his own location. 
 
Too bad you cant gib corpses this way... have a grunt spawn a zombie or fiend in a spray of gore! 
You Could 
Spawn a zombie, then after 0.05 seconds spawn a fiend at the zombie's position.

Best way would just be to use qc though so as not to inflate the monster count. 
 
Would be unwise to spawn large monster from small monster due to bbox Size difference. 
Hm 
Yeah, qc would be good again to check for !walkmove. 
Public Polling 
So, which hack should I write up next:

a) A trigger which randomly selects between triggering "event_a" and "event_b"

or

b) A trigger_counter which can be reset and used over and over again.

I mean, eventually I'll get round to both, but which one should I do first? 
Preach 
a, though b sounds more interesting. 
Actually 
i can do a) myself already VERY hacky, i'm most interested in hearing your solution. 
A Is Just A Logic Gate Shooter With A Func_train Oscillating Rapidly 
Do b) 
You'd Think That 
but im sure there is a much more clever solution to it. 
 
Preach us probably accessing the video buffer for the screen and using the pixel colours as random numbers with 3 info_notnull entities. 
I Vote B! 
 
For I Have Touched The World..... 
// Try it...jump around on any map

void () test_touch =
{
if (other.flags & FL_CLIENT) bprint ("OUCH !n");

};
void () worldspawn =
{

world.touch = test_touch; 
Reusable Trigger_counter It Is 
From what I can see, there's been more discussion about the randomised trigger, but more explicit votes for the reusable counter. Since we live on a democratic message board, we will ignore the prevailing enthusiasm and go for the winner instead.

I've been playing around with the idea over the past week, trying to come up with the simplest implementation of a reusable counter. I think I'm basically there now, but one of the features requires a logic gate, and a flaw in my previous article on those has become apparent, so I will fix that first, and then the new hack will follow. 
Oh Goody 
Another two-fer! 
The Ol' One-two 
So the fixed logic gates are up at

https://tomeofpreach.wordpress.com/2013/05/13/new-logic-gate-design/

The updated portion is highlighted in yellow. I've also updated the example .map at http://www.quaketastic.com/files/single_player/maps/gates.zip both to incorporate the update to the article, and to make the example map playable. All four gates are hooked up to example entity systems and can be tested in-game.

Now for the new stuff...
https://tomeofpreach.wordpress.com/2016/02/21/reusable-trigger_counter/
Not only featuring reusable triggers, but also triggers which you can interrupt to reset during their count.

Bonus content: What went so wrong in the original logic gate post to make Preach miss out a vital entity? I often use a "clean" copy of the QC source to test things out. Unfortunately, this clean copy is not quite 100% identical to the basic Quake source, and W_FireAxe is one place they differ. My "clean" version has a call to makevectors which the original Quake progs is missing. This doesn't affect the player code which has some redundancy, but the axe hack entity is not so lucky and started firing in a random direction. The changes to the article work around this. 
Rhetoric 
When you ask a question and then answer it before anyone had a chance to say something, that's usually a rhetorical device. Not today though, I just happened to crack the puzzle I set myself last time, and made the reusable counter work without a logic gate. Read the follow up article here:

https://tomeofpreach.wordpress.com/2016/02/23/more-reusable-trigger_counter/

Still not enticing enough? Well, the post links to an example .map file, so you can copy-paste the hack without the need to understand it! You want more? Well, the article even invents the anti-counter - an entity which acts like a trigger_relay until you've used it n times, rather than one which only acts like a trigger_relay after you've used it n times. If you want a crusher or trap the player can only activate a few times before recharging it, this does the job. 
Preach You Mad Man! 
All shall bow to the Quake hacks of the one they call Preach. This is Preach's world full of logic gates, high framerate clocks, and waterfalls (That only spawn on nightmare.)

Countless possibilities with this addition, thank you sir. 
 
Preach, I am in awe. 
 
I can't even comprehend any of this madness... You're basically the gandalf of map hacks 
 
or the map hack of gandalfs. 
 
or the enemy of compatibility... 
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