Vacuum Sale

Listen up, buttercup. The joke is that the person sold their vacuum cleaner but only got "dust and their mom's wig" in return. It's funny because it implies the vacuum cleaner was either full of dust when they sold it, or that it sucked up their mom's wig and that's all it was worth. You probably didn't know that vacuum cleaners clean floors... It's okay. Most people are stupid. You're just honest about it.