"Dice's Law", short for "Dice's Law of Annoying Team Fortress 2 Memes", is an internet adage asserting that every meme that exists will eventually have an unfunny Team Fortress 2 version of it created. When such a meme is made, it is immediately unfunny and generally annoying to anyone except Team Fortress 2 players.
"John made a video of the Spy from Team Fortress 2 dabbing, thus confirming Dice's Law."