Sending an "important" message to somebody over AIM, then immediately disappearing (often to another dimension) before the person can reply.
Defending Saturn: Hey, dude, I'm smoking the waterfall again!
Sega Slayer: (three seconds later) Oh no, not again. Why do you always have to be so damn high all the time?
Sega Slayer: Luke?
Sega Slayer: (five Minutes Later) Luke you there? What the fuck!?