Papyrus: Sans, stop being a lazy Bones.
Sans: Why bro, guess you don't have the back bone to do anything, heheh.
Lazy Bones
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This "Sans" dude is makin' a bone-dry pun 'cause he's a skeleton. Get it? "Backbone" because they ain't got no skin or muscle, just bones! Heh, you probably trip over your own feet, don't you?