Spiders on my head

To clarify, there was only one spider on my head. I was teetering on something trying to attack the big spider in my room when a smaller one fell on my head. You better believe I jumped down and shook my entire body like I was having a seizure. It fell. I killed it. Then I killed the big one. Later on I killed one in the bucket room. Today I killed another in my room. My roommate, Laura, has been killing them too. Yesterday we noticed that our walls and ceiling have shoe marks everywhere from our wild hunting. I wonder if, after we leave, they'll go in there and ask, "how in the world did they get a footprint on the ceiling?"