Any pet peeves about flying, on the ground or in the air?

Be curious to hear from others, especially if any are humorous

Mine is boarding the plane near the end of boarding when I fly T+ knowing there will be no issue with my cabin bag since it will fit under the seat in front of me, only to get to my seat and my seatmate has their bags under the seat in front of me and them because the overhead bins are full... then the cat fight begins