When you've been with someone for a long time, you can really discover their pet-peeves. You gradually learn the best ways to mess with them if they cross you. It's a natural consequence of being extremely close with someone. If your significant other is also your best friend the pranks only get more vicious, and hey, that's just what love is. I don't make the rules sorry.
If you also have a list of ways to get revenge on your partner currently stored in the back of your brain, you might find this list of Tweets both relatable and tactical.