50. Raiden Gets Peed On (MGS2)
While sneaking around the exterior of the Big Shell in MGS2, Raiden has to slide across a narrow ledge to another area. While he's inching along, a soldier on the deck above his head decides to relieve himself by peeing off the edge...and all over Raiden below him! Raiden keeps a stiff upper lip though, and presses forward. You can also call Raiden's girlfriend during his golden shower for an amusing conversation.
49. The Most Effective Camouflage Is A Cardboard Box
The cardboard box is an icon of the Metal Gear series. Conceptually, yeah, it makes sense to hide under a box when cornered by an enemy, but practically, is a battle-hardened, genetically-engineered commando going to be fooled by a cardboard box in the middle of a steel corridor? Probably not. It's still funny, though!
48. Death Means Nothing
Pretty much every character that dies in the Metal Gear Solid series gets reintroduced at some point down the line. Take Solid Snake's dad, Big Boss, for example; the guy gets incinerated in 1999, and 25 years later, he just shows up to have a final heart-to-heart with Snake in a graveyard.