Mine do the vanishing act too. Before we go out or to bed at night I do a head check, there are sometimes I can look and look & look and still no kitty! The entire time calling his name, then I look at the same place for the 100th time, and there he is, just sitting there giving me that "I've been right here all the time, what is so important?" look.

They can drive us crazy, but we still love them