I cannot stand abandoned shopping trollies in supermarkets...as a wheelchair user I find it difficult enough to navigate the aisles when it's busy etc, without people's carts lying in the way. I tend to react passive aggressively to this, and either hide their trollies or add lots of items to them. It is a way of venting to me. If I get pulled up by said trolley abandoner, I usually remind them that trollies have wheels and can go where they go too.