Answer:
What has a head yet it never weeps, has a bed but never sleeps, can run but can not walks, and has a bank but not a cent to its name?
The King of Pop's stellar dance move
A mechanism to discover who is following you.
Other terms for this handy device include doohicky, doo-dad, and whatchyamacallit.
Which popular cheese is made backwards?
When is it bad luck to see a black cat?