We put party popper charges in a pepper pot once
Someone banged it on the table when they couldn't get any pepper out and they nearly choked to death and couldn't see for about half an hour.

I also went through a phase of swapping the paper stuff in party poppers for foodstuffs. Horseradish sauce was particularly good and it looked like spunk when it landed on someone's dinner jacket.
( thistle, Thu 18 Sep 2008, 21:28, 4 replies)

i thought you needed friction for them to work
i wouldnt think banging on would have any effect. but then i havent tried it :D
( Rev. Jesse. broke his ankle, Thu 18 Sep 2008, 21:49, closed)

Consider this idea..
..nicked!

Have a click for the trouble.
( Butters and his titanium codsocket, Thu 18 Sep 2008, 22:26, closed)

We tried:
Talcum powder - works great, like a smokescreen
Hairgel - looks like snot if you use some green stuff
Small pea gravel - Ouch.
(Strangechap I look normal on the outside..., Fri 19 Sep 2008, 8:34, closed)

I've done this...
...with ketchup.

Turned a 40th birthday party into a scene from "Carrie"
( Scaryduck LIKES EGG, Fri 19 Sep 2008, 8:41, closed)