For my little brother's 8th b-day we printed out invitations on the computer and flipped the whole invitation backwards so that you have to put it in front of a mirror to read it. We had each child hang their head down while lying on a couch. We covered their nose to their mouth with a bandana. then we drew a mouth on their forehead. in the end, it looked like a man with a beard. we took pics of them and sent them out for favors. we also had a pinata and we glued candy to the outside of the pinata instead of putting it in it. we also had an obstacle course and the kids had to walk backwards and kick balls backwards. The person with the longest time wins!! The children also  dressed up really wacky and they wore their shoes on different feet and the girls put their pony-tails right above their fore-head. Then instead of cake, we placed a cupcake for each kid on a plate upside down so that the frosting was on the bottom. we stuck a candle on the paper part of the cupcake and sang "Mad deathday from me". than , we made hamburger meat in the shape of a hotdog and ate it as a hotdog. When the guests left, we said "hello, long time no see"