What unusual things make you feel sad about life?

I get sad when I see the trolly guy at our local supermarket. There he is putting all the trolly’s back in neat rows, only to have them taken as he is doing that. So it is like a perpetual ongoing mundane activity. Much like digging a hole and filling it for hours. Plus I think most treat him as invisible.

What sort of unusual or unspoken things make you sad about everyday life?