Hands down the worst experience I had was when I was going down on a girl and I started to taste something weird. It was kind of dark in the room...just soft mood lighting but I could see lots of dark spots on my light colored sheets and around her vag. I was like wtf and then realized I knew that taste...it was BLOOD!!! And it was everywhere including in and around my mouth, I almost puked. Apparently she got her period right when I was going down on her, just my luck. Anyway she started crying and I started ripping the sheets off my bed and looking for a bottle of Shout cause sheets are freaking expensive and I didn't want to buy new ones. Meanwhile she got dressed, kept saying sorry, and then she left...and I never called her again.