Opening and closing cereal boxes, cookie packages, books, etc. with letters, numbers, pictures printed on them.
Is One Allowed to Push a Carriage, Wheelchair, etc. on Dirt Ground Outdoors? Is One Allowed to Sit on a Chair on Dirt Ground...
Understanding "פסיק רישא דלא ניחא ליה" (inevitable results from one's permissible action whereby one receives no benefit from).