As a child, yes. I believe my mother put mayonnaise in my hair. That might've been when I got gum in my hair, though... but I don't remember. My childhood was filled with one of everything bad. xD
As embarrasing as it was for me, I had, twice, once when I was in the 8th grade, then when I was in my early 20's. I had been so tempted to shave off all my hair, but I just couldn't part with it. I can't remember how I got rid of it the seconde time but I did. I also can't remember how I got it either time, I think there had been some sort of outbreak at school the first time and the seconde time, I think maybe I caught it from, I really don't know, since I wasn't in school and I wasn't working at the time. I just remember that I hated it and I think it was my hair dresser who was finally able to rid it from my hair.
Only once when I was younger, and that was the worst week of my life. My head felt like it was on fire, and I was in and out of baths. As well as the fact all of my stuff had to soak in warm water as well. So yeah, I would never wish that upon anyone.