Worst Fly Gnat Pun

Funny Fly Gnat Punology Pun Joke

So there's this fly, and a gnat lands on its back.

The fly says, "Is that a gnat on my back?"

The gnat says, "Gnat at all."

The fly says, "That's the worst pun I've ever heard."

The gnat goes, "What do you expect? I just made it up on the fly!"