...I do think BYU needs to change their chair policy because 18" wide and 16" deep is too big. At the USU game, I had the same situation where the couple in front of me had awful chairs that gave me no room for my knees. When the wife (or possibly girlfriend) left for a bit, I slid her chair up and snapped a photo of where/how the guy was sitting:
Obviously, there's no space at all for me like that. I had to twist my legs to the side. We finally did say something, and they ended up leaving early. But those chairs should not be allowed--I would agree to that.