sitting on a donuthole

The story:

Third story lookout room, wrap-around windows at vacation house in Rodanthe, NC.... spring break, 11th grade.
Total quiet zone out session and everyone simulataneously hears Billy singing it.
He's noided about why we are all laughing. No one can stop laughing long enough to tell him.... for five minutes.
Once he got it and shrivelled in embarrassment, we handed him a another tube to get him out of the donuthole.