One day during a sermon at my old church, the pastor told a rather amusing story. When he first came to the United States as an exchange student and was learning English, one day there was an event at which tacos were being served.
Naturally, he had to try these, and was putting lots of sauce on his tacos. The others kept warning him, "It's hot, it's hot," but he dismissed the warnings, thinking they meant high-temperature, not spice.
He didn't elaborate much on the outcome, but I can imagine he found out the truth quickly when he took a bite. I have a cartoonish mental image of him breathing fire, eyes bugging out.