1. Flip a computer display screen upside down.
2. Drive the grammarian in your life crazy by tweaking their autocorrect.
3. Or if you reeeeeally want to up the ante...
4. Set their Facebook status privacy to "only me" so nobody will Like their stuff.
5. Turn their apps into cats.
6. Set a screenshot of their homescreen as wallpaper, and strategically move apps so they're repeatedly clicking on NOTHING.
7. Change all of the contacts in your friend's phone to the names of Harry Potter characters.
8. Rename all their files after Pokémon characters.
Or, you know, whatever floats their/your boat. This is hugely annoying to change back, but oh, the nostalgia.
9. Treat them to CAT FACTS.
10. If you work in an office (preferably where there are extra keyboards), switch around someone's keys.
11. Or block their mouse sensor with a Post-it.
12. Change the office printer's error message.
13. Pull a Nathan Fielder, if you're feeling brave.
Experiment: text the person ur dating "I haven't been fully honest with you" then dont reply to them for 1 hr (& tweet pic of thr response)
@nathanfielder waiting a hour would end a relationship.
14. Or try this one:
Experiment: text your parents "got 2 grams for $40" then right after "Sorry ignore that txt. Not for you" Then tweet pic of their response.
@nathanfielder strict parents though..
@nathanfielder my mom doesn't know weed terms at all
15. Cage-ify their Facebook.
16. Or, better yet, the entire internet.
17. Just go analog.
Simple, classic, elegant.