Cause he can't do stand-up.
Need Another Seven Astronauts
Because it was too tired.
With its punchline
A two liner.
Bay leaf get him out if here!
Cause it was invented in Alabama! Inspiration came from the comments(http://mobile.reuters.com/article/idUSKBN0GP1NS20140825 irpc=932)
Stephen Hawking after a house fire.
If you repair both, the E-Wheelchair is the only thing running again