update: I tried with all my songs and yes I know it doesn't work with every song. I just think it works if you play the song on time or it works with some sort of upbeat song. But yea, it doesn't work perfectly like you would expect.
There is NOTHING, and I mean NOTHING, I hate more than people on cell phones in public bathrooms. If you work in retail it happens ALL the time bc employees take "bathroom breaks" so they can make phone calls.