He looks at the cactus. He looks at his own head. He frowns. He touches the cactus spikes, winces, and then touches his own bald (or balding) pate. He sighs in defeat and shuffles away.

And then it happens.

Look for Sancho Bob.

He has no lines. He has no plot relevance. He doesn't even have a canonical house.

His name?

In at least three separate episodes, you can spot Sancho Bob walking past the Simpson house, usually holding a giant, spiky cactus.

So next time you’re rewatching Season 8 at 2 AM, don’t look for the chalkboard gags. Don’t track the couch gag. Look at the sidewalk behind Homer’s head.