Look out sentry! It's Bear Force One!
If you want the bear to leave, you'd have to reverse the polarbearities.
I'm pretty sure having a bear in your backyard is bearly legal.
Is the bear wearing shoes or is he bearfoot?
Bear in mind, bears are dangerous.
Offer him a picnic basket.
Ask him where Boo-Boo is.
Draw a circle in the sand.
I'm out of puns and references.