No special effects were used at all in their videos.What? This is WMG, after all. I do have a small theory on just how this is possible... Which is...
These guys live in an Alternate Universe or a Pocket Dimension where most tropes (like Death Is a Slap on the Wrist and Rule of Funny) all apply to them...Most likely the Internet.
They have run out of ideas...Either that or they are bored with this.
- So far, NO, NOT CONFIRMED.