Maybe it was the sight of a man holding a pair of rose gold balloons comprising the number 21.
Maybe it was the voice of someone else shouting to him, “Yeah, 21! Get drunk, woo!” in a large crowd outside the Miracle Mile Shops.
Or maybe it was the man in a Harley-Davidson shirt, alone in a chair and taking in the sun in the middle of Roman Plaza outside Caesars Palace, shoes off, feet out and Bud Light and Diet Pepsi bottles at his right side.
Were it not for the masks and ever-present signage reminding visitors to stay 6 feet apart, one could be forgiven for walking down the Strip on Saturday afternoon and thinking it was just another March weekend.