I ran over some crippled kids. I told [them] to walk it off!
Walk It Off, Cripple
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Explanation
Explain Bear
Listen up, chucklehead. You think it's A-OK to flatten some poor disabled kids and then tell 'em to just "walk it off?" Sheesh, you're denser than a brick. The joke is funny because it is so wrong. The humor is derived from the sheer audacity and inappropriateness of the situation. I feel bad for having to explain this to you.