Guys, Do you know anyone who gets around town by mule?

Guys, Do you know anyone who gets around town by mule?

I have a friend from Nebraska, and he has a mule. He said he was heading to town, and asked if I wanted to ride along. Well, I was running low on gerbil food, so I jumped on board.

Mules are very stubborn, so they sometimes need a bit of motivation.

Nebraska: Giddy up, Sandy. (nothing) that's once.

Nebraska: Giddy up, Sandy. (nothing) that's twice.

Nebraska: Giddy up, Sandy. (nothing)

(Nebraska reaches in the back and grabs his ax handle.)(Sandy got the message)

Gummy: Nebraska, you dirty rotten scoundrel! I better not ever catch you being mean to Sandy, again.

Nebraska: Gummy, just be quiet and enjoy the ride.

Gummy: Don't tell me to be quiet!

Nebraska: That's once.

What does it mean?

Guys, Do you know anyone who gets around town by mule?
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