Been there, done that!!!!!
I learned that lesson the hard way more than 10 years ago. My hot and sweet peppers are seperated by about 150 feet. And I have my hots in rows, habaneros at one end and jalapenos at the other, and in between they are in descending order of heat.
They actually were pretty tasty, used in a dish that works with the heat. But, it's a little disconcerting when you don't know it's coming, lol.
Same thing happens when you little purebred toy poodle gets loose and encounters the neighborhood scruffy male dog!