A commuter ferry passenger stunned his fellow riders when he stood up and gave a rambling motivational speech — that ended with him doing a belly flop into the frigid Hudson River.

But the only thing he inspired was an arrest by New Jersey cops after crew members had to turn the boat around and fish him out of the drink.

“The goal was to do something outrageous and entertaining while at the same time trying to motivate people,” the jumper, Alexander Vivanco, told The Post.

“I’m not telling everyone to go jump off boats, but just telling people to go after their dreams.”

Vivanco, 34, had a captive audience of about 10 passengers on the NY Waterway Manhattan-Weehawken run when he stood up and gave his speech around 5 p.m. Sunday while his pal videotaped.

The mohawked speaker liberally quoted self-help guru Tony Robbins as he prepared to take his leap of faith while wearing a shirt with the message, “Born to live abnormal.”

“Wanna take the island? You gotta be willing to burn the boats,” Vivanco said, paraphrasing Robbins.

“My recommendation is this — before you burn the boats, I suggest that you jump off them.”

Vivanco then removed his shirt, revealing a blue T-shirt underneath with the shape of Superman’s logo cut out and showing his bare chest.

“It doesn’t matter who you are or what you look like — you all have a gift!” he shouted.

“The gift is so powerful it makes us unique — it makes us superhuman!”

Moments later, Vivanco — a resident of Wanaque, NJ — stood up on a bench on the ferry’s deck and jumped off, belly flop-style, the video shows.

The ferry captain was forced to turn around and retrieve the loudmouth.

“I got a few cheers but mostly a lot of people were just pissed off that I disrupted their ride,” Vivanco admitted.

He was charged with disorderly conduct. His assistant posted the footage to Snapchat to impress the waterlogged wingnut’s pals, cops said.

“He was an a–hole doing a stunt,” NY Waterway spokesperson Pat Smith fumed, adding that the company plans to “seek the maximum prosecution under criminal and civil law.”