So I have a partner who is like my twin - we think alike and have the same general sensibility about the world. I love her to death.
The other day, a mutual acquaintance was texting her every 20-30 minutes or so. And my partner was getting really annoyed, because she doesn't really like this other person (I don't either). My partner was also on call that day...so that night I texted her every 30 minutes or so just to bug her. Best part was when she had to run out of the shower only to see it was me. I even sent her a text saying "And you can't turn your phone off!"
I'm still waiting for my payback.