[Rainbowfox Ari]

-Stretches out-

Okay, mine's bad - but here it is.

Son: Okay! I finished mowing the lawn!
Father: Alright, here's ten dollars.
Son: What? But I mowed the entire thing, and you told me I was being paid five dollars a foot!
Father: So I did.
Son: Then what gives?
Father: How many feet did you use?
Son: ...
Father: Two feet. Thus, ten dollars.
Son: ... -Takes ten dollars and leaves-

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Another one in the same vein:

Daughter: Dad! I can't figure this problem out.
Dad: What does it say?
Daughter: It says 'Suzie wants to start up a mowing business. She wants to charge two dollars per foot. Her neighbor's lawn is ten feet, by ten feet. How much should Suzie charge to mow her neighbor's lawn?'
Dad: That's easy. She should charge six dollars.
Daughter: Why?
Dad: Because it's one yard.
Daughter: ...