A: In recorded history? It would be Pickett's Charge at Gettysburg, at the moment when the smoke from the cannon bombardment cleared to reveal 13,000 Confederate infantry lined up for a mile, ready to step off into immortality. I would not be carrying a gun. I would be hiding somewhere. If it were non-recorded history, I would love to see what a T. rex looked like, and I would see if I could borrow a Barrett M82A1 .50 BMG for the occasion.