A particularly unkind note left by a patron of a Sioux Falls bar is drawing derision on social media.

Shenanigan's Sports Bar and Grill posted a tweet on Sunday, showing a tab from Saturday night.

The customer left a $1 tip on a $55.50 bill, adding "(expletive) you" on the signature line. For the record, that's a 1.8 percent tip.

"Anybody wanna fess up?" the tweet read. "Next time grow a pair and air your grievances with someone other than the 19yr [sic] old working her way through college. #Clown"

The server, Brooke Heinen, said the customers in question had come in to watch the Cowboys game.

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They were nice, she said, joked around with her for being a Vikings fan, and, until she picked up the receipt, it had been a great experience serving them.

"I was in complete awe," she said. "And I think what hurt the most was that they were such kind people. I don't know what went wrong."

Heinen said her manager had her back, and the supportive comments on Twitter have been helpful.

Several people asked if she had a Venmo account, or whether they could stop by the bar to make up for the Saturday tab, but Heinen said no one owes her anything.

"Things happen, and you just take what happened to shrug it off," she said. "Sometimes it's better to just laugh!"

Sioux Falls Mayor Paul TenHaken tweeted out words of support as well, saying that the behavior "is not Sioux Falls."

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