Two wrongs don't make a right, but three lefts make a right.
Three Lefts
Explanation
Explain Bear
Listen up, buttercup. This joke is all about wordplay. The saying is "two wrongs don't make a right," meaning doing bad things doesn't fix other bad things. But the joke twists it by saying "three lefts make a right," which is literally true if you're giving directions, cause three left turns will put you on the right.