Shard's is Jontron
Metal's is Gabe the Dog.
Cyber's is Dipper with a tuba.
Kami prefers funny cat videos.

Example

They all watched the video above and broke out in which meme was the best. Metal won a bet that they'd have Gave as the game over song so they had to watch this.

[There should be a GIF or video here. Update the app now to see it.]

ALL OF IT

(Bonus)
Metal fanboyed when it got to Hopes and Dreams, Cyber fell asleep halfway through, Shard was okay with the Toriel one, and Kami called Gabe a majestic pet of magic. Cyber woke up in time for his favorite part of the pacifist ending credits. Shard, shortly after watching the video swore he heard Gabe barking that night.