Dh and I went to a beer festival with some friends last weekend at a local pub. In the garden, there was a bouncy castle and a trampoline (both unsupervised). There were a lot of children using the trampoline without nets - sometimes 6 or 7 of different sizes at a time.
DH and I ended up leaving quickly as I was getting more and more worried that I would be watching a small child give themselves a horrible injury. Dh thought I was being a bit precious given that it wasn't our DC leaping around.
So over to you Mumsnet jury - which of us is right!