Reclining your seat on a plane is one of those things that you’re technically allowed to do, but you probably shouldn’t.

In airlines’ attempts to squeeze every last cent out of customers, they’ve removed as much leg room as they possibly can without it becoming a fire hazard (and started charging you if you want to sit in an exit row). As a result, flyers already have precious little space that they can enjoy on a flight — space that gets greatly reduced if someone decides to recline their seat.

Still, if the person in front of you reclines and you really don’t want them to, you can just, you know, ask them not to. What you shouldn’t do is this: