When attempting to tame a horse while holding a saddle it causes the horse to "freak out" aka, make the sound when you are kicked off the horse but you never get on it. It dose this infinitely
Note: the horse will never be tamed sadly. If it was then this would be the fastest way to tame a horse. A bug with potential

Steps to recreate
1: get a saddle
2: find a horse thats untamed
3: hold down on the horse (Ie, try to ride it) while holding saddle.
4: profit. Or ehh... Bug?

Just tested it and it still happens in 0.15.2 but its not as fast anymore, alot slower.