Both are a play on words.
Because he'd always get nailed into the boards
Hide the ball it drives them nuts!
Because it was crumby.
Well a joke that isn't funny, but still is because it isn't. If you know what I mean. These are kind of much easier to remember.
Nothing. It's a gift she will always remember. Edit: Wording clarified (Thanks to therinnovator).
Postbox.
Thesaurus.
The Thesaurus