building a better mouse trap

I don't personally own a mac laptop, but someone on my floor does. The charger plug in part is kind of large, so whenever she tries to charge her laptop on a wall outlet, it's so heavy that it keeps falling out. There isn't really any way to keep the charger in the wall except for someone who is not using the computer to hold it there, which is annoying. So basically there should be a way to make this product, the plug in thingy specifically, less bulky, so it stays secure in most wall outlets.