my Favorite Easereggs were in : Gothic 2 - behind the great Orcwall where a giant orc army was supposed to be was nothing but a table with a message that everyone in the game lied to you and to not belive everything they ares aying signed by the MIGHTY ALIEN DWARF
anotherone in gothic 2 was a graveyard with a bunch of gravestones with funny messages and names here is a gravestone of the mighty alien dwarf with following words written on it : Mighty ALien Dwarf 2894-3787 "This is All Fake Belive Me"
Chompski the gnome in left 4 dead 2 in the dark carnival chapter there is a shooting gallery and if u get 750 points playing it then u get chompski the gnome (melee weapon)
My favorite easter egg was the mario mask on the back of the happy mask salesman
http://www.google.com/imgres?imgurl=http://www.deviantart.com/download/140752021/Super_Mario_Mask_by_WbKenji.jpg&imgrefurl=http://wbkenji.deviantart.com/art/Super-Mario-Mask-140752021&usg=__drhHyo0qiTkQxvks5rAl25DnO0E=&h=476&w=639&sz=39&hl=en&start=0&tbnid=dCtF8o3LTTvwKM:&tbnh=159&tbnw=214&rev=/images%3Fq%3Dmario%2Bmask%26hl%3Den%26biw%3D1362%26bih%3D565%26gbv%3D2%26tbs%3Disch:1&itbs=1&iact=hc&vpx=912&vpy=192&dur=802&hovh=194&hovw=260&tx=131&ty=171&ei=iSpXTPGAM5TCsAPYzY3bAg&age=1&ndsp=12&ved=1t:429,r:4,s:0esmen in LoZMM
Call of duty finest hour on the level operation little Saturn if you find the hole in the level's wall and if you go back far enough you see a 60 story apple with a UFO inside it
and there was a secret campiagn in Command and conquer Red Alert 1 when you got the expansion sets and you click on a certain place in the main menu during pressing the shift button you could play a secret campain against giant Ants - the campian has the title "It came from Red Alert"
i liked the one in gta vice city stories were if u kept swimming against the boat u would glitch inside and there would be a floating sign saying "theres nothing to see here" and a smiling face
if you glitch a piece of furniture out of the apartment on ps home (the one you start with) there is a hard to find sign somewhere out of the apartment if u get the furniture over to it it says "YOU REALLY SHOULDN'T BE ABLE TO READ THIS" watch this to see