Concert Seating
You have tickets for a concert and when you arrive you find that there are people already sitting in your seats. When confronted, they either claim total ignorance or mumble about not reading their tickets correctly. Do these people think that, the people who have bought the "good seat" tickets are either not going to show up or say "what the hell, you have these seat and we will take yours instead.
6 Foot Tall People at General Access Concerts
You got to a concert early and have managed to get a good standing spot at the front by the stage. You patiently wait there the hour or two for the concert to start. Then someone and their stupid friend arrive just before it starts and push their way past you to stand directly in front of you where they will spend the whole time of the performance talking to each other.
Why are they always at least 6 foot tall so you can't see the stage because they are in the way...
