The annual Lower School Pumpkin Race at the Landon School in Bethesda, Maryland is a tradition where students design and build custom race cars out of real pumpkins to apply hands-on physics concepts.  Each student or team builds a “Pumpkin Racer” using a single pumpkin with two independent axles - testing wheel placement, axle alignment, and wight distribution to ensure their pumpkin rolls straight and fast down the track.
Pumpkin races combine physics and fun video here.