1) shove a baby bottle in her mouth and lock the door (LoL my friend came up with that)
2)kill her friends O_O omfg, don't do that
3) dress her up as a baby and show Master Frown
4)kill master frown
5) scream f*ck you at the top of your lungs
6) say that happyness is bad
7) poke her... WITH A STICK!
8) call her dumb rainbow cat
9) play dead...
Running out of ideas...
10) say "Unikitty, you are LMFAO!!!!" (She will think you are saying lameo she hates tricks)
11)um.... Play a prank on her
12), hm..... I'm done...