This brings back fond memories of a section of our floor (in my old house) that did something similar. The wires underneath weren't grounded properly or something, touching something metal would often produce a shock or a strange tingly feeling in the fingertips. After shampooing the carpet once, I went to plug my computer in... BZZZT!
That, in turn, reminds me of when I first got my PS2. I went to go plug it in and the outlet literally exploded!