Sophomore year - grand slam over the RF fence - about 345'. It was a wild game - something like 7-8 HR's between the two teams. Yea, it was a hitter's night. Have a video of it somewhere - almost didn't get it - had just turned the camera on.
Went on to hit 2 HR's his freshman year in college (JuCo) and 6 HR's his Junior year - one was a grand slam.