Mine was caused by a window. My main PC positions my mouse hand just below what was a single-pane window. It was the first I upgraded to a storm window. Before that I tried several things to stop the downdraft. Towels rolled up across the top, blinds, plastic film over the whole thing. Modern windows are so much better.
An ex had cold hands all the time. She'd grab me in strategic locations and send me through the ceiling like a startled cat.
If I'm ever tortured to divulge military secrets, cold hands & pulling my leg hair will be the quickest way to make me talk. #&(@*&#$(^%!!!!