GWB could have found another way to be funny.
A lot of people died, a lot of families are grieving, and not just in the US, because GWB told the American people that Iraq had WMD and were preparing to use them against the US.
The latter wasn't even close to being true, and he knew or should have known that. However, the people are still dead.
He could have joked about his problems with the language, especially with a librarian for a wife, about how to spend all the money he's raised, about his "election", there are a lot of things he could have made funny without poking fun at himself on that one.
Because he also made fun of the people who died. And are dying.
Arf