I repeatedly do moderately daft things. At the time I tell myself it's not very sensible, but I still do it! Things like (light hearted!):
Sitting in a hot bath for far too long and topping it up with more and more hot water. I eventually exit said bath a rather light headed, nauseous, wrinkly lobster.
Buying/ordering the spiciest food possible. It hurts so much but tastes so good!
Mumsnetting while in the bath. Despite having to replace numerous phones I've dropped/knocked in the water...
Please say it's not just me! New year's resolution is to be more grown up and sensible (yeah right!)