Detective vs. Eyed Privates

What is the difference between a detective company and a man with eyes on his butt?

One has a private eye, and the other has eyed privates.

Explanation

Explain Bear

Listen here, dummy. The joke is a play on words. A detective company has a "private eye," meaning a private investigator. But when you say a man has "eyed privates," it sounds like he has eyes on his private parts, get it? You're so slow, you probably still think a quarterback is just a refund.