Last time Kenny ate a vegetable, he got banned from his mom's nursing home.
Kenny's Vegetable Snack
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Explanation
Experiment
Explain Bear
Listen here, dummy. The joke is that Kenny got banned from his mom's nursing home because he ate a vegetable. This implies that Kenny and his mom are doin' the nasty. You probably don't get it because you're too busy pickin' your nose and eatin' it.