There's a nice box of cold beers in my fridge - almost empty since it's almost a day old now. I was trying to get a beer out from the back of the box, but couldn't get it out through the hole.

After struggling several times I was suddenly reminded of the fact that Borneo hunters trap monkeys by putting food in a box with a hole smaller than the food, and the monkeys get caught because they refuse to let go of the food.

Hmmmm....