It's a game created and played by students. When out for a meal, all people at the table have to stack their mobile phones in the middle of the table.
You then have to leave them stacked for the entire meal. Sound on. Face down.
The first person to cave and look at their phone has to pay for the meal!
This is a game Leigh will never win. Claire's looking forward to playing it next time they head out for some food!