I once owned a Catalina that if I'd had the resources I wanted to paint up like a Trans Am and letter it "Trans Aint"
That's when you spike the lunch with dick hair and toenail clippings, and leave a nice little note the next day.
A friend at my previous workplace had this issue. Well, he grew his own ghost peppers, the real deal stuff. He put some flakes on a piece of pizza one night and left it in the fridge. I don't believe he ever had an issue after that piece of pizza went missing.
I was told a story about a guy that kept having his lunch ate.He just so happened to have a baby at home,and made a nice baby poop sandwich.The guy got fired for that stunt.
Ha, that's pretty damn funny. I think, in this case, he wouldn't have any issues. He's a super hot pepper nut and actually uses stuff he grows. We went to buffalo wild wings one night and he ordered whatever that hottest wing flavor was. The one they do the "challenge" with. He didn't break a sweat and ate all of them like they were mild. Never seen anything like that. I would used to get the mango habenero when I was younger, but that would still cause my nose to run and break a little sweat. Anyhow, moral of the story is he could say that was his pizza prepared the way he liked it.
I had a guy that kept getting into my 2 liter of Dr.Pepper when I worked inside.I poured a ton of salt,and day old black coffee in on it,and never had that problem again. I will never understand people taking things that don't belong to them
A more simple approach with carbonated beverages is to periodically give the can/bottle several vigorous shakes during the day. When the culprit opens it to get a drink he will self-identify.