Barack Obama was definitely in the mood to play a little "just the tip" with the cashier at Five Guys burger joint last week -- as in, dude totally let her keep the change!
TMZ talked to the lady who took the $72.40 order from the Prez, and she tells us he let her keep the extra $7.60 from the $80 he threw down.
It ain't much -- but how many of you actually tip for fast food?!
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