My daughter's version of the polar bear in the fridge joke

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AJ:
Mom! How do you get a polar bear out of the fridge?

Me:
I don't know, how?

AJ:
You put the butter under its butt and slide it out! Ha ha ha ha!

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The real joke

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A:
How do you know there's a polar bear in your fridge?

B:
I don't know, how?

A:
From the footprints in the butter.

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We need to work on memory retention. :
)