The answer to this riddle/joke is: A 100 What (as in Watt) Bulb.
Here's more to make you smile (funny one-liners from tetraplegicliving.com):
A bartender is just a pharmacist with a limited inventory.
A clean desk is a sign of a cluttered desk drawer.
A clear conscience is usually the sign of a bad memory.
A closed mouth gathers no foot.
A conclusion is the place where you got tired of thinking.
A day without sunshine is like, night.
Be nice to your kids. They'll choose your nursing home.
Beauty is in the eye of the beer holder.
Beer: It's not just for breakfast anymore.
Check out the top 50 funniest jokes ever told, brought to you by the researches of Onepoll.com.
Being funny is hard work. Some people think that humor is easy, that anybody can be funny with very little work. This is not true.
To be funny there are a lot of things you must know about humor and a lot of situations you must prepare for.
So, here's how to be funny, shared David J. Parker and Samuel Stoddard of Rinkworks.com.