Make flushing an explosive down a toilet do something amusing

[warcrimes]

hm hm but gentlemen

what about

chem beaker bombs into the toilet

does the foam flood thru the entire invisible plumbing system, or does the water dilute it too much?

i FEEL this with all my heart. 
All toilets should flush into a common invisible container, with each flush also adding a certain amount of water as well as whatever was flushed. Flushed stuff remains irretrievable, but if you dump a bunch of chems in different toilets they should react, and if violently enough, should backflow up a certain amount of the products into every toilet. If the reaction is exceptionally violent, 1x2 explosion at each toilet head, destroying the porcelain. 

this brings new strats for sending chems to inmates, or just mucking up someone's hiding spot.