Making up a storyline for my comic HELP!?

I have to make this comic for art.. It turns out it has to be about a prince who is told all his life that he has to save this princess person. She is locked away in a tower guarded by this alligator thing. The prince then sees this other guy who wants to rescue the princess as well. They separate, trying to save the princess before the other. Now I don't have an idea of what I'm supposed to do. I want it to be kind of funny. :)