One of those train things where you basically propel it using a sea saw, often in cartoons.

Rick rolled wherever I click on the page haha, weird

How many?

One time I flew with Emirates and they had a little pack on your seat that had stickers to put on the seatback in front - red that said let me sleep and green said wake me for a meal. Flew with them since and haven’t seen it again but I thought it was a great idea!