What do you call a horse that can't jump?

This joke gallops along on a fantastic bit of wordplay, taking a familiar term and giving it a hilarious equine twist. The humor mechanism here is a pun, relying on the double meaning of "low rider."

On one hoof, a "low rider" in the context of a horse that can't jump literally means a horse that stays low to the ground because it's not clearing any obstacles. On the other, and where the real chuckle comes in, "lowrider" refers to a specific type of customized car. These iconic vehicles, which emerged in the post (Review)-WWII era and gained significant popularity within Chicano culture, are famous for their lowered chassis, often fitted with hydraulic systems that allow them to drop incredibly close to the pavement, sometimes even bouncing.

So, the joke paints a silly picture of a horse (Review) that not only fails at the equestrian art of show jumping, where horses are meant to gracefully clear fences and obstacles, but also humorously evokes the image of a car cruising "low and slow." It's a delightful bit of linguistic mischief that finds humor in the unexpected intersection of equestrian life and automotive culture, all thanks to a simple, well-placed pun.