I was going to ask what's wrong with your thumb but then I recollected a story I was once told about masturbation and thumbs and I think I shall prefer to remain ignorant though I now can't stop that bloody imagination of mine from merrily jaunting wherever the hell it pleases because I have less than zero control over that bastard thing.
Your imagination sounds like a fine thing to me and your know, it might be on the right track!! Lol