if the 20th anniversary t-shirt was
back:
RUNESCAPE 20
front:
HIDE YOUR SHEEP
that like everyone who works at jagex would want one, and probably like 80% of the current players, and it'd draw in a bunch more. a shibboleth, but one worth the laugh.
https://runescape.wiki/w/Sheep_Shearer
I have quit rsof because moderator found comments about darklight bonus damage on demons "off topic" for wildy flash mobs full of demons