Waiter, waiter, what's wrong with these eggs?
I don't know, sir. I only laid the table.
This joke is a pun on the verb "to lay", which has more than one meaning (and is regular and irregular).
lay, laid, laid (irregular verb): prepare knives, forks etc on a dining table
lay, layed, layed (regular verb): (of a bird, chicken etc) produce an egg
The past tense forms "laid" and "layed" have exactly the same pronunciation.