Don't usually care about late arrivals and early leavers much, but last night really took the piss.
An entire family of five about two rows in front of me turned up 25 minutes late. They then took a good minute trying to find their seats, dilly dallying in the aisle, getting up and sitting down again, until someone behind me shouted "Jesus Christ are you lot coming or going or what?"
They then all got up for half-time dead on 40 minutes, all slowly making their way to the aisle again. After half-time they all came back on 50 minutes, again, taking their sweet time. Then they all left on 85 minutes, standing in the aisle and turning round whenever the crowd made a noise.
They saw precisely 50 minutes of a 90-minute game and affected everyone else's enjoyment with their constant twitchy feet. If I know I'm gonna be even 10 minutes late for a game I just give my ticket to someone else and don't bother going. Think they need to start shutting the doors after a certain time tbh - if you're not in by 15 mins, sorry.