I know it is a lame reason for some but we had season tickets in the south end zone and two large older guys had the chairs right in front of us. We would ask them to be considerate and pointed out that they were leaving us about 2 inches of leg room. We would move when we could but they were so annoying it made the game miserable for me and even more so for my wife. We could call security but that felt even more lame. This was after a few years of getting my wife more into BYU football. The next year we switched seats and ended up with the exact same scenario but different guys. My wife is patient but that pretty much did her in.
We have the money now where we can pay for better seats but I'm working to convince her again. BYU either needs to ban the chairs or at least make people use the ones BYU provides that actually fit the benches.