You, The Player, was a mute poker player at the Inventory for a while, and every night you have played against four other poker players, Sam, Brock Samson, Ash Williams, and Claptrap, with GLaDOS and Max as extras

But there was something about Sam and Max that you guys didn't know, until you five were having a poker tournament until Claptrap pointed it out

CT: " Hey Sam?"

Sam: " It's another dog question, isn't it?"

CT: " No! It's actually something different. You and Max seem smaller"