When your kid sleeps in between.
Because you don't want them hanging around Parks at night.
Mine is: What is the white stuff in bird poop? (That is also bird poop.) edit: til you can't edit the topic to fix spelling errors...
You rock them. What if it doesn't work? Use a bigger rock.
There is twenty of them.
Off-by-one error. :(
He who makes a mistake in an elevator is wrong on many levels.