Cyanide, like carbon monoxide, is almost unnoticeable. It'll give you a headache and make you feel drowsy, but before you realise there's a problem, you might end up
unconscious. My money is on the toilet chemical being a common or garden
acidic gas.
Of course, the official explanation was that a
cleaner left a urinal deodorant on a radiator. Although having observed the Keystone Chemists in action,
someone decided not to push it, and returned the purloined jars of
thiodiglycol and phosphorous trichloride to Glyn James's chemistry store. Allegedly.
Someone else who was playing around with poison gas in the early 90's (and I don't have to say "allegedly", because he's hardly likely to sue now) is
this charming fellow. Unfortunately, during the first Gulf War, one of his Scud missiles veered off course, straight towards Roger Hackett's physics class. Allegedly.
And if you don't want to see Mr. Fl
apfat
hammer on the headmaster's door,
impotent with rage, whatever you do,
don't mention Yahweh's Hospital. Allegedly.
Superficially unrelated to the film of the same name, the Candyman club involved a certain recently-published
book (now on the
web), given rather incongruously as a chemistry prize, and a close group of friends who would, shall we say, re-enact passages from it. Double allegedly.
Oh, and that explosive radiator paint Julian mentions was presumably
nitrogen tri-iodide.
By the way, I'm curious as to what happened to that litre bottle of amyl nitrite left Down Under as a going-away present. Allegedly.