Friends in your contacts on your phone who only send you forwards, and when you really want to text them, they never text you back (Especially right after a forward.)
Robert: Ooh! A new text from Claire! *opens it* All I get from this chick is forwards! I'm not going to "pass it on" and I'm not going to die..
Jill: Looks like you have some forward friends!.
Robert: There's only one friend...
Jill: I know.