I've had my head snapped by the person behind getting up...as I recall I was on Northworst and I got one of those seats that recline by themselves. I was constantly pulling the seat forward. Then bozo behind me decides to get up and use the lav. Boom, he pulls me back into the fully reclined postion. I ignored it the first time. By the time the flight was over, he had done it three or four times. I was ready to go ballistic.
two:
Getting banged in the head with someones oversized luggage being lifted into the overhead compartment.
three:
Exiting the plane and someone decides to put on a jacket, then get something out of their luggage, then comb their hair, etc. etc. while blocking the aisle.
four:
Window seat passenger staking claim to BOTH armrests. Give some sympathy to the poor guy in the middle.
five:
The guy that has to cram that last monster bag into the compartment that your luggage is in, when their is room elsewhere.