Have these ever been up for discussion before? They are a set of 4 hearses, each one carrying a coffin with either a vampire, frankenstein monster, skeleton or mummy. When you press the skull hood ornament, the coffin pops out the back and the monster inside sits up. They were released a few years ago, but you can find them...
Here's an image of the mummy hearse...
(http://www.geocities.com/grimtoys/mummy.jpg)
Chris, I remember every dealer seemed to have them at the first few Monster Bash events then they seemed to fade away.