Next Stop, Comedy Central

Claire told her first joke today:
"There was a bug on a sack. Why was the bug on the sack? The sack was closed and he could never get out."

Her second joke:
"Knock knock who's there?"
pause
"Watermelon!"
hysterical laughter from her buddy Isaac

Her third joke:
"Knock knock who's there lemon head!"
more hysterical laughter from Isaac

As you can see, she has a very sophisticated sense of humor.