people enjoying themselves with the speakers

yesterday I went to a club that under the dj booth has a wall of speakers, around 1 meter tall. good hard techno night, ~60 at the club. at one moment I see a girl wearing jeans, touching the tip of her toes, with her butt leaning against the speakers. at first I thought she was stretching, but then I noticed she'd go back every time the bass dropped.

I'll assume she found those vibrations really satisfying hahaha. have you ever seen something similar??