Snow globes. Specifically, busted snow globes.
Glass candle jars with lids. That guests pick up by the lid, thereby dropping the base of the candle on the ground.
Melons = squishy = fruit flies.
Anything in Home Decor that is triple wrapped, with foam, plastic wrap, and double boxed. Bonus if it's heavy... looking at you wall mirrors.
Women's swim suits. Zoning and reshopping a billion different styles, straps untied, and each guest tries on eleventy million apiece in the fitting room.
Shoes. I would probably quit in a fit of rage if I had to work in the shoe department every day.