ISTPs: Working in the trades, you encounter an above-average number of them. Easy to socialize with, laid back, fairly friendly. Some of them are such "ordinary people" that you have no interest in their MBTI type. That's okay, there are worse sins than being unmemorable. We're here to get the job done and get home. One ISTP at a previous job however, was very memorable. Cynical, paranoid, a little grouchy. Street smart. He'd gotten involved in a shifty hobby, grown very wealthy from it, and was thrown in prison eventually. He had a fondness for me, even though he criticized alot of my noob mistakes at work. He seemed to want to mentor me, frequently giving me useful life tips since he declared me too sheltered. (He also let me take his daughter out on a date. Nothing came from it but still a flattering gesture). Maybe I should catch up with him sometime.
ESFPs: Have not had good experiences with the people I think are this type. High school theater classes, there were a decent number of them. Intelligent and talented but also superficial, selfish and histrionic. I intentionally would freak them them out with my behavior and words, which I enjoyed at the time but looking back was just as immature and thoughtless as they were.