Metro: Last Light is an intense first person shoot backed by an impressive story. It also may contain a humorous Easter egg many players missed.

Reddit user Just-hope posted a series of images that suggest GlaDOS (the evil artificial intelligence from Valve's Portal series) may in fact make an appearance in the game. Well, sort of.

As you can see, what at first appears to be random chunks of busted concrete could be a loving homage to the untrustworthy AI. 

What do you think? Coincidence, or is Metro developer 4A Games big fans of Portal and its sequel?