And it's not pretty.
Their carrying on even provoked actress and comedian Sarah Silverman to say bluntly during her Democratic National Convention speech on Monday, "Can I just say, to the 'Bernie or Bust' people — you're being ridiculous."
Still, the chants of "Bernie" persisted, and even Sanders' own plea for his supporters to refrain from protest on the DNC floor as a "personal courtesy" couldn't stop them. Here are some of the other unstoppable heckles you may have heard from the "Bernie or Bust" camp:
"We trusted you!"
Sanders supporters chanted "We trusted you!" during Massachusetts Sen. Elizabeth Warren's endorsement of Clinton on the convention stage Monday night.
"We're here today because our choice is Hillary Clinton," Warren said. "I'm with Hillary." The subsequent jeers followed closely, just two minutes into the senator's speech.
"Lock her up!"
The night leading up to the DNC's kickoff, Clinton spokesman Brian Fallon's interview on MSNBC was interrupted by Sanders supporters calling to "lock up" Clinton, presumably for her use of a private email server during her time as secretary of state.
Their cries for criminal prosecution echo those of Republicans', albeit less extreme than Donald Trump adviser Al Baldasaro, who said on Wednesday, "Anyone that commits treason should be shot. I believe Hillary Clinton committed treason."
According to the New York Post, the Sanders camp began chanting "No TPP!" during Maryland Rep. Elijah Cummings' DNC speech Monday night, protesting the controversial Trans-Pacific Partnership deal Clinton once supported.
Monday night's TPP protest, though, could have been worse: Consider this dildo to the face, for one.
Real original, guys.
Correction: July 26, 2016
A previous version of this story mischaracterized Tuesday's events at the Democratic National Convention. Hillary Clinton officially became the Democratic Party's presidential nominee.