It's good to take the trash out.
Dan's apartment is gross because he hasn't cleaned it in months and his mother is visiting him in a few days.
Dan doesn't want his mother to see that he is a slob.
Dan thoroughly cleans his apartment and throws out all of the garbage.
Dan hides his trash in the closet instead of throwing it in the apartment building's dumpster.
Dan's mom spends a wonderful weekend with her son and brags to her friends about how well Dan is doing.
Dan's mother smells the trash and has to book a hotel room rather than staying in the apartment.