How can i come up with a catchy story plot for a movie?

You want it all at once in an email and it just does not work that way...what you need to do is "live it" and by that I mean keep your laptop or pen & paper with you at all times and become completely absorbed with the task of tying this all together. If you get stuck on a scene, keep an eye out for something similar in your daily life [if something is to take place in a car wash, them hang out at one...remember: it's the details that sell the scene. Whatever the place can't offer is where the screenwriter in you has to come through...use your imagination and keep working on it]

just have two co-ed girls in a dorm having a pillow fight, knock at the door, swedish plumber come to fix the shinck ... and it pretty much writes itself from there ....