The *Official* I Remember a Scene from An Obscure Film, But...

...I can't remember what the hell the movie is!

I got a bunch of these from my childhood that have been irking me for quite sometime. Two specific ones come to mind:

1. For the slasher movie fans out there, I recall watching USA Up All Night about 10 years or so back. They used to run B-grade horror movies all the time. There was this one that took place at a sleepaway camp, a la Friday the 13th. The one scene I recall is some fat dude goes to take a piss on a tree, and when he turns around, he gets axed in the gut and his bladder spills open (pouring out yellow, which is presumably urine, even though he just emptied his tank). The only other thing I can remember that might help is that the killer was a girl (sorry for the spoiler if anyone actually wanted to see this movie).

2) This one is more vague, but might be easier to get. Also from 10-15 years ago. All I remember is that it's a few kids who sneak out of their house and start building this spaceship in some secret hideout (like a treehouse, or something). IIRC, at the end of the movie, they end up flying the thing over their town. I suppose the movie had a Radio Flyer/Flight of the Navigator feel to it, but is neither one of those.

Anyway, I would love to hear some that make your list. I'd love it even more if you can shine some light on mine.

(moved from The Lounge, because I need instant gratification)