Answer:
1) Find your person, then wait til they greet you
2) Give them a dirty look, then say they did something bad in a time that hasn't happened yet like "i cant believe you got arrested tomorrow!
3) Wait til they give you a "huh?
4) Wait til they respond, then change your expression to happy and say "like, seriously?!
5) Again when they get confused, say "you know what i mean
6) Finally, just walk away saying, "great chatting with you!" or "nice conversation!