Bowser's Secret

In Mario & Luigi: Superstar Saga for the GBA (Game Boy Advance) in the begginning of the game when Bowser fell into the cannon the stupid fat guy said that if Mario and Luigi don't give him 100 coins then he will blaber Bowser's most embarrising secret.

Now I want to know one thing what is that secret or should I say what do you think is Bowser's secret?

Getting defeated so easily is pretty much the secret. If everyone in Mushroom Kingdom knew Bowser was a wimp, they wouldn't be afraid of him anymore.

Maybe he has a crush on Peach.-Fromage-

Everyone has a crush on peach in that series. Even Luigi.

Well; he has a journal in Paper Mario that shows him to be a very average guy, despite his bravado. He's shy, more or less, when it comes to Peach, especially in the RPGs. BUT if you ask for my non-canon opinion, I'll tell ya what I think.

I think Peach likes Bowser too, but think, if she were to get hitched to a giant dinosaur, what would the Mushroom Kingdom think, with her being a Princess? So she and Bowser use Facebook or whatever to preplan the kidnappings, while Bowser makes up some crazy 'take over the world' motif to keep Mario distracted while he gets to spend time with his love. Basically Peach is kidnapped for a few months at a time to catch up with Bowser, Mario 'saves' her, and Peach lives the mundane life as the princess, bored and lonely until she gets 'kidnapped' again. Mario works well in that he doesn't question the motives, or how she gets kidnapped so easily (maybe Peach let the guards in on it) and basically, he's the key component for making this complicated forbidden love scenario possible. This also may explain the Bowser children scenario, but we won't go that far into it.

TL;DR: Peach and Bowser got the hots for each other, Mario doesn't even know.

He has naked pictures of Bowser and was gonna put them all over the internet