What can we do to make lunchtime enjoyable?

Me and my 2 best friends just sit down and talk at lunch...but that's all we ever do & it's really boring. Sometimes we walk around, but only rarely something fun happens. We're girls & freshman in high school. I just wanna do something hilarious, memorable & fun, but we got nothing [NOTHING INAPPROPRIATE LIKE DOING DRUGS OR VANDALISM PLEASE!]. Any ideas?