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New York mayor Bloomberg accepts PJDs 9/11 memorial bike.

In the World Trade Center bike Aftershow, Paul and the crew talk about their favorite part of the bike and music.

Paul and the gang respond to questions about the World Trade Center bike, including whether or not they were surprised when the Mayor of New York City sat on the bike at the reveal.

The arrival of a custom chassis begins to give some shape to OCC's "evil, crazy, I'm-going-to-kill-your-town" build-off bike design.

One difference between his bikes and OCC's, according to Jesse? They not only look good, they function.

You know, as the Teutuls will attest -- and demonstrate -- you can pull off a REALLY good prank with the "shock pen."

Wanting to "freak Senior out," the OCC crew pulls a prank that makes the man flinch in a way we've never seen before.

Senior's perfect poker face is a thing to behold as Rick Petko returns from lunch to find the bike he's working on with Junior dangling from the ceiling.

A frank conversation with Junior and Senior about their troubled relationship ends --- surprisingly -- in an "I love you" and a hug, sending the Chopper Live crowd to its feet.

Relive those last few minutes of American Chopper Live: The Build-Off, when Jesse James and the Teutuls awaited YOUR verdict, and the winner -- Paul Teutul Jr. -- was announced.

Jesse James discusses his build-off bike (which he hopes will "translate on a show like American Chopper"), his return to Discovery Channel, and his thoughts on who will win.

If you think that building a bike is easy, check out the process that the Cafe Racer team goes through.

Continuing fabrication on the smooth-looking March of Dimes bike, the PJD team develops a unique handlebar with hidden controls and brake lines.

Mikey describes his new morning routine of lifting weights and giving fingerless-glove high-fives at the gym to Vinnie.

After a period of silence, Junior calls Senior to give his condolences on Helen's passing.

A clean-shaven Michael and the mayor of Montgomery, N.Y., step on the scale for their final weigh-in as part of their fundraiser for Will, a local child with leukemia.

At an event celebrating the 25th anniversary of John Christner Trucking, Danny Christner surprises his dad with not one OCC chopper ... but TWO.

Junior explains his specific plans for updating the Black Widow Bike, which, after 10 years, has many outdated or worn-and-torn parts and technologies.

Mike, Jason, Rick and Senior discuss their love of tools, reflect on the X-rated cake sent by Jesse James, and reveal their plans for the trip to Vegas for Chopper Live.

With Senior out filming the Celebrity Apprentice, it's up to Christian to take the super-long, super-heavy and super-awesome Grainger bike out for its maiden voyage on a beautiful fall day.

The OCC team works on fabrication of the Trump bike.

As he watches Chopper Live with his crew, Junior looks back on the live event and offers potential reasons for some of Jesse James' comments during the build-off.

Donald Trump welcomes Senior to Trump Tower to discuss the design for his chopper, and explains why he chose OCC to build the Trump Bike.

No stranger to family businesses, Donald Trump gives Senior some tough-love advice after hearing about the state of his relationship with Junior.

Christian and Nick finish the final assembly on Donald Trump's new, long, loud and very gold chopper.