During last year's NBA finals, the Miami Heat's home crowd gave a master lesson on how to fail as a sports fan.
Looks like many of them could use some lessons from this grumpy grandma.
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Uploaded to YouTube on Wednesday afternoon, the clip, above, shows the unidentified elder getting, er, heated at LeBron James and company, their opponents, the referees -- basically acting like a testosterone-laden sports bro transmogrified into the body of one sassy grandma.
Watch for yourself -- and try not to crack a smile. If you're a self-described Heat "fan"? Be sure to take some notes.
[HT Deadspin]
BONUS: 25 of YouTube's Funniest Sports Fails
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