Why do violists smile when they play? Because ignorance is bliss, and they don't know what can't hurt them.
Violists' Smiles
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Explanation
Experiment
Explain Bear
Alright, listen up, you cotton-headed ninny muggins. The joke is saying that violists don't know enough to be worried while playing. Like, they're too dumb to realize they're messing up. You probably think Nickelback is good, don't you?