I have a couple, mostly with draft horses because that's what I helped show.
One four in hand of belgians broke sort of loose (took part of the wagon too) and ran threw the fair grounds, a little girl was seriously bruised and a broken leg when she got slammed into.
Watched an unruly six in hand of percherons (first time for most of them) being drove through busy fair grounds without anyone other than the driver.
A percheron stallion tie stalled next to a mare in heat and he wasn't happy about it to say the least.
A six in hand haflingers, owned by two different owners the rear two where not the drivers team. The driver wanted to use his wagon and the not even a lap around the front wheels fell off the wagon and it caught the back two haflingers hind legs doing a lot of damage. One was so scared of being hitched for a year.
We got to a show with the drafts when the light horses were leaving. A little girl's pony didn't do well in barrels to her father (think 200 pounds) got on this tiny, wiry pony (maybe 400 pounds) and kicked the pony until it would move. It wasn't pretty.
Drunk old men.