If you're feeling down, David "Big Dave" Sylvester wants to help.
"Free high-fives, free hugs, anything to make you smile," called out Sylvester, 53, as he stood in front of a Philadelphia park on a brisk Thursday morning.
He held a sign reading, "Hello, my name is Big Dave. BigDaveHugsTheWorld," which he shifted to his left hand every time he reached up to touch palms with those passing by.
Across 30 minutes, dozens of strangers take Sylvester up on his offer, from police officers to suit-clad business people to students hustling from the subway. All reach a hand to the sky for a golden smack, occasionally to be followed by a deep embrace in Big Dave's arms.
Over the past 17 years, Sylvester has clasped hands or squeezed arms with what he estimates to be around 250,000 people in 36 countries. He chronicles his journey on his website and social media; on Instagram, his handle is @thehumanhigh5. "A hug and a high five is something we can all do — it's a moment of power."
Outside of City Hall, that power manifests itself in the form of instant smiles across faces of those of every age. Often isolated in their own worlds, with headphones hanging down from ears to phone, people stop in their tracks to take in the unexpected nature of Sylvester's sign and welcoming vibe. Sometimes, the power generates not only a quick grin, but sudden tears, too.
"Often they'll say little else but 'I really needed that' and then keep walking," he said.
Not everyone, of course, wants to interact with Sylvester. This includes tons of passersby casting skeptical looks, and a security guard who not only declines a high five, but eventually kicks Sylvester out of the park.