Found a little easter egg while browsing QL website code. Didn't find any mention of that on the internet (or my googling was not good enough), so here it is:

1. Open clan_id_real sponge's profile statistics.
2. Shift-doubleclick on the player model picture (it's a Ranger / Sport_blue right now) and your user icon will be replaced with Doom protagonist animated face.
2. Shift-alt-doubleclick on the player model picture and you will see a greetings from sponge.