I think that gene skipped a generation with me. My father thinks the manuals are in case it doesn't sit level on the ground. You stuff the manual under whatever part is short.
Me - I actually read the manuals. Freaks my wife out too. I'll come home with a new toy of some sort, open the box, fish out the manual, then put the box aside while I read the manual. I think I caught her looking up psychiatrists for me a couple of times.