The Ladder Test
If playing an online game and wonder if you lag, you start climbing up a ladder in the game, to see if you make it to the top or if you just keep on jumping from on top to on bottom.
Gamer#1: "Dude! I so shot that guy in the face, and it took him freakin' three second to die! Bajingless!"
Gamer#1's Online Buddy:"Do The Ladder Test. I see one right over there."
Gamer#1's Online Buddy:"Do The Ladder Test. I see one right over there."