I had a salivary gland stone once that I squeezed out with my fingers, I can still remember the pop and then gush of saliva after it fell out. It was huge, and I've never had one since.
About a year after having lived in Africa, I had a shower and was drying off my belly button when I had a weird feeling in my tummy/lower groin area. I had another root around in my belly buttons and out came a very large oval stone of dried sweat and hair. It absolutely stank, and I've been paranoid about possibly growing another one as I have a rather deep belly button.
When I was a kid, we had a really lazy cocker spaniel who was happy to lie on her back for hours while we plucked blackheads from her tummy. She would be absolutely carpeted in blackheads, despite being bathed regularly. I remember once rubbing her tummy and realizing she had a bump by one of her nipples that turned out to be a huge blocked pore, it was about the size of a cashew, it popped out of her skin and she sniffed it then flopped back down again with a humpphfff and let me carry on. She was the best dog 
DP has what I can only describe as a small tunnel in the skin in one armpit that fills up with goop. I think it's all but closed over now, but I used to have great fun squeezing either end and getting a huge ribbon of thick gunk out if it. Apparently my father had something similar on his neck that a pin could be pushed through to clear it out, but after many many years of sporning, his has closed over. I will be devastated if DP's does the same.
Quite recently I had a really heavy period-I usually get them about twice a year and when I do I will get a big inflamed spot somewhere on my pubic area-I can only assume it's connected as I don't suffer with them any other time but when I have a rotten period. This time, the spot was an inflamed pubic hair follicle, that, of course, was right on my knicker line. After about two days of limping around with sore boobs, horrible cramps and sleepless nights, the spot popped and a double hair came out of the follicle with a not too small amount of yellow pus. The following day, in the exact same spot in the opposite side of my pubes, I got another one, far harder and more inflamed. I spent a few hours prodding at it, and it popped with a crack and a huge blob of green pus hit my knee. That's it for another 6 months or so, until I get another cracker of a period.