Typing in the cheat code "WUV WOO" will get you a magical, purple, flying hippo that wears a top hat and shoots hearts at its enemies... But that's not the funny part. Click on its description. Now you can laugh.
Same with the Canadian Laser Bear and his monkey friends. Surprisingly, this is one of the most powerful members of your team.
The blooper reel towards the end of the credits.
Also when Ajax suggests that Arkantos's boats need repairs:
Arkantos:[defensive] You don't think they can make it to Atlantis? [boat creaks and capsizes] Ajax: No...
Ajax and Arkantos are good for these in general. Another amusing interaction occurs when Arkantos suggests the Trojan Horse.
Ajax: I don't understand... Will it fight? Arkantos:[facepalm]