When did spiders learn how to become invisible?

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They've either learned how to be invisible or they've learned how to cross into another dimension. :P Yesterday, I woke up and went to take a shower. When I came back in my bedroom, I was straightening up my bed when I saw it: a medium-sized Eeeeeeeevil (tm) black spider sitting on my bed! My bed! The Holy of Holies! That's not right! Everyone knows that it's against international law for spiders to be on someone's bed. But there it was. It had started to run, but stopped when it saw me looking at it. (Looking at it in abject terror, I might add.) We stayed in a Mexican standoff, neither one moving nor looking away from each other, for a good 10 minutes. Then I realized I could easily stay stuck standing at the foot of my bed for the next several decades if I didn't make a move soon. I quickly glimpsed around the room to find something to hit the little ... (insert a word that begins with a "B," ends with a "D" and means the offspring of two unmarried spiders). I saw a board over in the corner that is part of a disassembled blanket rack I own. While continuing to keep the spider in sight, I got the board and made my way back to the bed. I was hoping to "rack" up a kill, or at least stun it enough to be able to transport it out of the house. I quickly took aim and ... THWAP! Down on the bed came the board. When I moved the board, I realized with a sick feeling in my stomach that I had missed, or had hit it so hard that it was pulverized into billions of microscopic pieces too small for the human eye to see. While I was hoping the latter was true, I knew deep inside that the former was probably the case. Except ... where did it go? It didn't fly up when the board hit the bed. It didn't get hit by the board (because there were "evidence." Ewwww!). It was no where to be found. And believe me, I looked. I looked everywhere. The only possibilities are that it turned invisible or transported into another dimension, or both. :P Now I dread sleeping in my bedroom, not only because I fear the spider will come back from The Planet of Invisible Spiders, where it's obviously gone, but because I've sprayed enough chemicals in there to kill small Third World country. What do you do when the spider you were hunting gets away and is still on the lose, able to terrorize innocent humans at will? :P