Lactic acid

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The fiery pain in your legs and butt when you run like a madman after your girlfriend yells at you for eating the last of the pizza.

My legs felt like they were on fire after I sprinted home because my girlfriend threw a pizza box at me.

I ran so fast to escape the dog that I felt lactic acid in my butt like it was a punishment from God.

I ran for ten minutes after my dad yelled, 'You’re not getting a second slice!'

The result of laughing so hard your face turns red and your butt feels like it’s on fire from the inside out.

I laughed so hard at my friend’s terrible joke that my butt felt like it had a hot dog in it.

After my mom told me I was the worst kid ever, I laughed until my butt burned like it was on fire.

My cousin’s face when he saw my dog wearing a hat made me laugh so hard my butt felt like it was melting.