Easily the most nervous I've ever been on the first tee shot was my round at The Old Course. Standing outside in the singles queue and getting into the first tee time of the day had the adrenaline pumping. Stepping onto the tee with no sleep, no warmup, the heart racing, and being the person to kick off the golf for the day was terrifying. I chunked the crap out of it and it only went about 50yards in front of me. Luckily I hit an absolute rocket on my second and the caddy said "shoulda done that one first mate." That got the nerves out of the way and the rest of the round was great.