Mmmm. Grab a chainsaw, put on some fur coats, and jump out at people randomly, yell "AAAGH!" and them, and then chase 'em through the corn maze with the chainsaw whirring dangerously.
I'm not kidding, that was one of the scariest things ever. On Halloween night, my friends and I went out to one of the corn mazes, and they had people chasing you around EVERYWHERE. It was terrifying. And they'd chase you when you got close to the exit, so you'd get lost again. I swear my heart was pounding five billion times faster than was healthy.
But of course, this wouldn't work if it wasn't at night. Things aren't scary at night.