The punchline
Ten. (Shame this one doesn't work too well for reddit - the funniest part of this joke is the third punchline enjoying people struggle to understand what the hell you're talking about.)
It didn't register.
Find out in the next episode of Dragon! Ball! Z!
Oranges have thick skin. Let the downvotes fly, people! You've only got one! Edit: Did not expect this joke to get this good of a reception. Thanks, guys!
The punchlines are too long.
The punch line.