It is polite to share your tissues with people
Bonnie has a runny nose due to allergies, and asks if she can borrow her co-worker Betty's box of tissues.
Betty doesn't want to listen to Bonnie sniffling all afternoon.
Betty gives Bonnie the box of tissues, and they both get their work done.
Betty refuses to share, and tells Bonnie to go home if she's sick.
Bonnie comes into work the next day with a new box of tissues and a Thank You card for Betty.
Bonnie goes home, loses an afternoon's pay, and is peeved at Betty.