The sheer number of (equally hammy-sounding) titles gained by defeating Lee and Guy in Survival Mode. Just when you think "Come on, there can't possibly be any more.." another one pops up. Even more so considering the next survival match (Naruto, Sasuke and Sakura) only gives you one.
The Tale of Killer Bee. To put it into context, this is unlocked AFTER the Tale of Madara, which even roles credits, so its essentially a post-game story. So far each tale has an opening animation (Very pretty ones, at that), then segways into still pictures of characters in situations being narrated to use, then a similar thing, but with the actual characters talking, then the fight. Bee on the other had decides that the game doesn't have enough wacky. Each of his "Between battle" things are animation, including the opening an closing, and each time, he raps, the opening telling him straight up that he's going to fight 4 others with no story reason, then rapping about who he's fighting next, with appropriate costumes and props... and each time he defeats someone, they go into the background as defeated back up dancers. That's not the funniest bit though. The funniest bit is that the last two people he does this too are Sasuke and Kisame. And the icing on the cake? Your either doing this tale for the animation, or the fact that you get to unlock Bee by beating it (And only Bee, by this point you have everyone else)
An unintentional example, but one of Naruto's win quotes is "You think a guy who loses here could ever become Hokage?!" Due to the nature of the game, it's possible to have him say this... to the First Hokage.