What did the man say when he knocked down the bookshelf?
Looks like I've only got myself to blame...
Bookshelf Blame Game
Explanation
Explain Bear
Listen up, you knucklehead. The joke plays on the word "myself" sounding like "my shelf." The dude knocks down the bookshelf, see, and then makes a pun 'cause he's the one to blame. It's wordplay, you imbecile!