It was just another day at the Coalition Drum Shop in La Crosse, Wisconsin, when in came a mysterious grandma who proceeded to blow everyone away with her unexpected skin-slapping prowess.

"We have no idea where this lady came from, what her name is, or where she went," a shop rep says, "but she rocked our faces off!"

Here she is allegedly using double bass pedals for the very first time. Rock on, memaw!:

[H/T: Daily Picks and Flicks]