They make me a little bit scared.
They overturn all known laws of food safety. Reheating? Only for a few dozen times until strimmed down to the metallic core. Refrigeration? What? They just sit there turning, hot, then cold, then hot. If you did that to normal meat it would rise up like some microbial zombie and chase you.
I've not eaten a proper one for years but I did use to love them. Hell, we used to eat the frozen ones from Diamond Frozen Foods in Tuebrook, but we were students and thus the alcohol levels in our blood meant it would probably qualify as disinfectant. They were great, you microwaved them and, as we did have any vegetables, just double the amount of chilli sauce. Truly the supper (and breakfast) of champions.
Real ones, with vegetable matter and a full meaty calorific load were a treat of stupendous wonder to end a boozy night. I do confess that one hung-over morning in Edinburgh I thrust my hand into my trenchcoat pocket and straight into another pita pocket of half-eaten congealed kebab. It might not have been so bad if it hadn't happened on the bus and I had to keep my hand embedded in cold kebab until I got off. As my [Scottish] flatmate pointed out, he would have eaten it.
I also have a very dim recollection of a kebab from Rusholme. I foolishly demonstrated my bravery to a girl (who I suspect was less impressed than she ought to have been) by requesting extra chilli sauce. More, more, more, I fervently declared, until the resulting kebab looked like a chilli volcano. I managed it. The next morning the entire lower part of my face was numb. And yellow. It wasn't a day that got any better. You can only put off the toilet for so long.
They're slightly better quality in North America (the 'donair' in Canada, some variety of gyro in the US usually) so you can actually eat them without shame. I do like to tango with the risk of dysentery every now and then with a lamb gyro from a NYC street vendor.