Last time I bothered to take the dds to the park, parents were almost coming to blows over turns on the two baby swings.
We waited for ages until it was quiet, and finally got a turn. Then a mum appeared with a toddler screaming "I want to go on the swings" and trying to get near. After about 20 seconds on the swing, it was too much to take the poor boy's misery, and after many evil looks from the mums with him, I pulled dd out of the swing to let him on.
Cue her going ballistic and even then all I got from the other mum was a tut. Not even a grateful look.
That's when I decided it was shitty shite at the park