My mare was introduced to a bit (and a bridle) about 5 months ago. Training has been slow, but ever since her first time with the bridle on (it was almost too easy) she will suck on anything! I woke up this morning to find that she had her halter off, but did not go any where, she was sucking on the poll band just like it was a bit, and when I took it from her, she started to suck on the rope
So I put a piece of nylon rope on her halter so she could suck on it while I groomed her, she was as happy as ever
So what funny quirks do your horses have?