When you just can’t seem to slot your bag easily into the overhead locker on a plane, and it’s made more difficult by not having enough space to step back and assess the available space, and by people on either side of you being very irritated that you’re taking ages.
Visible exertion, flapping, increasingly aggressive pushing and shoving of the bag, reddening face, perhaps even grunting. Embarrassment, resentment, self-loathing.
What causes it?
The angle of the locker and the fact that you can’t really see the available space properly so you’re forced to just start stuffing the bag in and hope for the best.
Who is affected?
Absolutely everyone who flies in standard class.
Can it be avoided?
Yes. Avoid the overhead locker altogether and travel with a bag small enough to put under the seat in front.