if someone keeps stealing your sandwiches, replace an ingredient with shards of glass!
edit
seems people took this joke seriously 😐
I am 95% sure that this is illegal, at least in California. Which is a little disappointing, but just letting you know.
However, it’s perfectly legal to put in enough sriracha to ruin someone’s day, as long as you can handle it.
This is why I eat spicy food for every meal. I’m playing the long game.