You know when it happens. You're 5 minutes late to a class in a huge lecture room. All the seats by the aisles are taken so you have to give everyone in the row a lap dance to get a seat in the middle. Equally common is the aisle hurdle, when you jump over a row to snag a seat.
10:15 AM..crap! "excuse me, excuse me, pardon, excuse me, pardon me" as everyone puts up their desks and stands up/moves their legs aside
"Dude, look at the guy who's late. Guess he has to give everyone a lecture lap dance now"