So... I went fishing yesterday evening amd then went to find an ocelot to tame. After chasing an ocelot for a while and givig him all my fish he didn't love me enough yet (I will be back with more fish, though!). Then I was sailing back to my house and came across a swimming horse. I went to help him go back to the shore by pushing him with the boat and when I was like two feet from him there was some lightening and the horse became, all of a sudden, four skeleton scary horses and four arrow-throwing bad guys. That was bloody scary!
Anyway, thanks for all your help so far, and a special mention to @Greboth who left a massive house warming present at mine. I would not have been able to collect all of that in 2 years so thank soooo much!