Urban Meyer's Wife -- HAIR CATCHES ON FIRE ... During BDay Dinner

"Happy birthday to you ... happy birthday to you ... happy birthday dea ... OH MY GOD YOU HAIR'S ON FIRE!!!!!!!!!"

Ohio State football coach Urban Meyer had a minor emergency at his wife's 50th birthday dinner this week ... when she went to blow out the candles and accidentally set herself on fire.

The moment was captured on camera by her daughter Nicki who wrote, "You know you're 50 when your hair catches on fire. Shelley Meyer girl on fire. Literally. The most beautiful mommy in the world! Never a dull moment. #typical"

Don't feel bad Shelley ... you're not the first person this happened to -- just ask Skrillex ... who set his locks on fire during a bday celebration last year.

[h/t BroBible]