McGrath listed the electric can-opener and the carving knife. I bought an electric can opener when my wrists were hurting from turning over bolts of fabric on the job. (It hurt to open a can.)

I use an electric knife to cut up ham when we cook free lunch for 200 at a local church. Again, it's easier on the hands.

A lot of dead ends are minor:

lipstick that you put on and lick to spread it
shampoo that had one green portion and one blue until you shook it
pop beads
hula hoops

Bye for now. I'm off for a week starting tomorrow.