Some of my riding friends have started a running joke about how much I carry. After listing stuff I do carry, they moved on to stuff I actually don't, then to the absurd: a bowling ball.
Yesterday morning I was riding with one of these guys and my chain broke. He thought I'd have to take the bus home. Nope. I carry a chain tool and master link (SRAM chain) and was back on the road, with dirtier hands, before long.
Most people would carry a tool kit like mine on a tour, but I tend to carry it all the time. I've been known to carry a spare tire on my LHT at all times, although I stopped doing that recently.
I'm considering getting a used bowling ball (a lighter one!) to put in my pannier for my next ride with these jokers.