i lost a condom inside of a girl once. neither of us knew it at the time, but she came up to me a couple days later and said "...i'm not upset or anything, but i just want you to know that my body just rejected a condom". she was not a very good liar; i could tell she was very upset about it, and obviously thought it was my fault or that i knew and didn't tell her or something. i was visiting her from out of town at the time, and she made the last couple days of my stay a living hell. never talked to her again after that.
another time i was fucking this girl from behind on a rickety old futon. all the screws were loose, and it was swaying around all over the place. anyway, i'm going at it like nodoby's business, and i guess, unbenownst to me, i must have slipped out of her vag and gone straight to the hilt up her ass in one swoop. i heard a weird suction sound followed by a blood curdling death yodel that still haunts me to this day. she jumped up and sprinted to the bathroom where she locked herself in for a good 3 hours convinced i tried to murder her with my dick. she was in there panicking because her asshole wouldn't un-dialate and she thought i had broken it and that she'd have to go to the hospital. it took me weeks to finally convince her that it was a complete accident. the combination of the rickety futon, body fluids, and ferocity of the act somehow created the perfect storm that led to the anal deflowering of such an epic nature.