There were plenty.
At the old Highfield Road Stadium in Coventry, all the younger ones would head for the greasy spoon cafe (at the back of the stadium) between sessions and sit in there. Then the Elder's would turn up and order us all out. It happened every year.
The funniest thing for me was winding up one of my pals. I was watching him cosying up to a sister over in another part of the stadium - away from his family, and trying to be as discreet as possible.
Knowing that his phone was on - with one of his 'rap' tunes as the ringtone, I took out my phone and dialled his number. Then I sat back and watched the fun. He nearly jumped off his chair as the phone went off full-blast. All the people in front of him turned round to stare and then the attendants were on him.
Gotta give it him, he saw the funny side and was pointing at me in a way that he was going to get even.
The other time I set off a fire alarm at Dudley with my cellphone. The whole assembly was evacuated. I was stood next to one of those sensitive fire alarms and as I switched my phone off I heard it 'bounce' off the alarm. Next thing I knew the whole place was going off.
What made it worse was that it wasn't my assembly, so the minute I emerged from the area where the alarm was, two big burly attendants grabbed hold of me either arm, and frogmarched me down the stairs. They were asking who I was, what I had put in my pocket (they had saw me put my phone away) and what 'organisation' I belonged to. Then another older guy started berating me in front of all these disgruntled Dubs who'd had to leave their spiritual feast.
Then when they were ready to call the Police, a familiar face appeared and vouched for me. The assembly went over by 45 minutes that day.