Itch You Can’t Scratch

Have you ever had an itch you just couldn’t scratch? I’m not talking about anything metaphoric, just a physical itch. I dunno, maybe it only happens to me, but it’s like a nerve connection gets screwed up or something. But I feel an itch, and try to scratch it in the region it seems to be coming from but I can’t find it – it’s not there. So I try scratching random areas – my head, my butt – still no relief. My coworkers must think I’m insane because I’m furiously scratching my entire body head to toe and still can’t find the stupid itch. Argh!!