I have a fair few but I will just tell you the scariest one. This has a bit of a pre-story to it.
Pre-story - One night some how the fence broke and my horse Banjo got out and we didnt know till the next morning. He went walking down the road and he ended up getting hit by a car. He was EXTREMELY lucky to have survived. The vet was even shocked he could stand up. He had massive chunks out of his hip and his back leg and a few deep cuts around his body. He ended up being ok and he is still ridable, after he recovered of course, but he had a massive fobia of cars for a while.
The story - I was out on a trail with my friend and we had stopped to eat our packed lunch. We tied the horses to trees while we were eating. Chucky my horse some how managed to get his leg over his rein. This completely freaked him out and he went mental. He ended up pulling out the tree ( it was only a few metre high one and half dead). He jumped around and went bolting down the road with the tree underneath him! A few things about this freaked me out. Firstly, there are heaps of big logging trucks around where we were riding and I was sooooooo scared he was going to get hit cause im extra parinoid cause of what happened to banjo. Secondly I was scared for him cause he could have got really hurt with the tree under him. And thirdly, we were surrounded by bush so if he went in the bush and kept running not concentrating on where he was going he could have gotten lost and we would have never have found him! I jumped on the horse my friend was riding (Banjo, who I was so proud of for staying so clam during all this) and went running after him. Thankfully he stopped about 300m away. He got away with only a few cuts and bruises. I was still able to ride him home. Although he was really shaken up about it all. Poor chucky.