I just saw this weird spider on my shower wall and I did this.What was that?

I was showering and then I see thos black thing so I splashed some water on it.Then it started moving so I ran out and opened all of the windows thinking that maybe it will leave but it didnt.So then I putted on my pj's and a paper bag on top as well as some gloves big shoes and a hat then I took a book and covered it with a towel ans I smashed the thing but it was still alive and moving so I jumpred on it with my body!