What kind of spider has legs that continue to move after killed?!?!?

i was in my room and i saw a rather big spider on my carpet. it was like the size of a full-grown daddy long leg. it's body was green/brown with skinny brownish legs. i got my sneaker and squashed it meaning to kill it. but it was still alive after i hit it with my shoe. i did this like 4 more times until it stopped crawling. i thought it was dead but it's legs kept moving. i kept hitting it with my shoe but i continued to move. all its legs were disconnected from the body. okay, now this is the freaky part: all the legs continued to move by themselves. they were not connected to the body. and it was muscle spasms or whatever. they were all moving randomly like it was still alive in a way. they kept moving for like 30 minutes. i finally got a vacuum and vacuumed the legs and body up and they were still moving as i vacuumed. what kind of spider is this?! is there a name for it?! it freaked me out so much. it was like a zombie spider or something. scary.