I was at my local wholesale/retail grocer in Niagara Falls Canada (Lococos) and a tourist couple was asking the staff about the hottest peppers they carried to make Chilli. The grocer said that the Jamaican Scotch Bonnet peppers were the very hottest they carried (and this company has every kind of produce you can imagine).
I saw the couple fill a whole plastic bag with Scotch Bonnets. I seriously hope they didn't use them all in their pot of chilli.