Can you help me with a prank Reddit?

I had this idea for a prank that I would wait next to the bridge near my house, out of site on the side, wait for someone to come buy, and quietly start playing a scary/spooky song on my acoustic guitar. Sneak away before they see me, and do it again, rinse and repeat til they dont know what the fuck.

Does anyone know of a good song I could use?

Also, any other cheap/free fun prank ideas?