As a teen I volunteered at a large outdoor competition type event for kids. The volunteers were all there 6am-6pm and we ran the entire event. No paid staff, majority of volunteers were high schoolers or college students. There were multiple catering stands positioned around the whole event as this was the main way we made any money so plenty of opportunity for the parents and competitors to buy refreshments.
There was also a volunteers tent with free food and drink for the volunteers. They never gave us enough, so we'd always run out before the end of each shift.
I was running the volunteer tent towards the end of the day when a woman I didn't recognize pushed her way into the tent to the front of the refreshments line. I asked her if she was a volunteer, she said no she was a mom of one of the competitors, but was gasping for a coffee and the lines at the drinks stands were too long. So she wanted me to give her a coffee out of the volunteer supply.
I explained to her this was the volunteer tent and was only serving volunteers, I couldn't take payment so she'd need to go and stand in line with everyone else.
She said no, that was fine, she'd take a free coffee here.
So she expected me to serve her for free because she was so desperate for caffeine she couldn't stand in line with everyone else.
I'd had a crap day and was only doing this job to get work experience for a paid job application in the fall, so I argued back with her that we couldn't just give out free coffee to any mom who didn't want to stand in line or there would be none left for the volunteers. She called me every name under the sun for denying a 'hard working mom a cup of coffee.' The nearest coffee stand for non-volunteers was about 10 feet away.
The volunteer manager finally stepped in when she told me to go fuck myself. I was a minor at the time. She and her kid were banned from the competition. She had to be escorted off site screaming and raging.