Gretzky was playing catch with Brooklyn Nets owner Joe Tsai when some onlookers dared the NHL career points leader to show off his skills.
The first behind-the-head pass sailed wide of Tsai, but the second was, to no surprise, right on target.
Las Vegas was awarded the 15th franchise in NLL history on Monday, and Gretzky and Tsai joined Brooklyn Nets coach and two-time NBA MVP Steve Nash, a fellow Canadian, and PGA golfer Dustin Johnson, Gretzky's future son-in-law, as investors in the team.