I watched a couple today park their butts at the gate door this morning at ORD waiting to board a flight to MSP. They just had to be first on the plane and I could see why.
Two large bags each

I was in 4B if F cabin, they were in 3E and 3F on the bulkhead. I was the 5th person to board, or was trying to board. I was stuck at the door waiting for Mr. 3E and Mrs. 3F to stuff all of their luggage in two whole overheads on the right side. Even though these bins are deeper, they insisted on putting the rollerboards in sideways. And then 1/2 the second bin was used for the guys hat and scarf.

Talk about inconsiderate bozos. I'm really starting to hate selfish people like that. I was glad I was on the other side of the aisle.