My kitchen sink is my thinking cap… This does explain why your neighbors keep talking about the guy who keeps standing on his head in the kitchen sink. Of course, they would talk even more if you were walking about with a sink on your head. I find a nice thinking cap can be made with a bit of newspaper or aluminum foil, although my neighbors tend to look away when I wear either out.
Information about American English usage here and here. Floating point issues? Please read this before posting. — emc