It happened in the supermarket yesterday in Washington DC.
I was just buying some table wine, and I got carded as usual. I was ready to be annoyed by being carded, and I was ready to come up with some lame jokes while processing payment, but the cashier was faster: you've got good genes.
Suddenly I didn't know how to react. I just laughed. Here's to youth and good genes. Cheers!
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