Jim Carrey and Jeff Daniels do the fake arm thing with Jimmy Fallon

Jim Carrey and Jeff Daniels visited “The Tonight Show” on Tuesday, not to promote the opening of their next movie, but to promote the opening of the trailer to their next movie. “Dumb and Dumber To” doesn’t hit theaters until November, but the reunited stars were doing their best to drum up interest in the followup that was 20 years in the making.

Since Jimmy Fallon rarely lets a guest drop by without having them perform in some way, Carrey and Daniels were soon drawn into the classic “Real People, Fake Arms” sketch.

Ostensibly, the sketch is a clip from an obscure Canadian soap opera called “Jacob’s Patience.” It’s always set up as a job the actors did much earlier in their careers, and it has involved such Fallon guests as Steve Carell and Justin Timberlake. The main gag is that all the performers use mannequin hands instead of their real arms.

As Carrey told Fallon: “That was one of my better pieces of work, in fact I think it was my favorite I’ve ever done. ... I’ve almost forgotten about it.”

In this sketch, Carrey and Daniels played fast food workers. And bonus points to Carrey, who snuck in a shout-out to the classic “Saturday Night Live” “Cheeseburger, cheeseburger, cheeseburger” sketch.

And though the stars seem to follow a loose script, not even Fallon seems to foresee getting splashed with “milkshake.” If he’d known, he would probably have prepared with a water-proof microphone.