Single crap female

The lightbulb in my bathroom blew this morning. I was on my way to work so I decided to leave it until this evening to sort out. I failed. I can't get the darned thing off of the ceiling. I've unscrewed all three screws around the outside and it is still attached. I have no idea what to do next. I predict a mercy phone call to my dad taking place in the very near future. Hopefully, the stupid thing won't fall off of it's own accord in the meantime. It's glass and will almost certainly smash. Right, I'm off to have a shower and shave my legs in the dark. Wish me luck!