A tandem bicycle is that type of two-seat bikes with two sets of pedals that aging liberal couples and teenagers in Public Service Announcements ride everywhere. It works on the principle "2>1", according to which, it's easier to ride if there are two people doing the pedalling.
But, not all is good, because, as always, evil rears its ugly head in the form of a Tandem Parasite. This is the one in the back seat, whose parasitism is not visible to the hard-working front-seater. The rear-seater doesn't pedal at all, but rather crosses his leg and smiles as the poor soul in front of him does twice the work he should be doing - the idea here is that the rear-seater is mockingly taking advantage of the rider.
It should be noted that, sometimes, the parasite has some reason not to pedal, like being distracted, or having been hurt, if you buy those cheap excuses.
- An Australian ad for KitKat has a woman taking a break and eating a KitKat on the back of a tandem bike while her boyfriend continues to pedal.
- Tested in Monthly Girls' Nozaki-kun when Nozaki and Sakura are trying to find ways to make tandem-bike rides more romantic as shoujo manga material (because Nozaki's not allowed to show the protagonist giving the heroine a ride on his one-seat bike as it's illegal, and he wants to avoid the "walking with your bike to accompany your beloved home" cliche). Thinking having both of them pedalling isn't romantic enough, Nozaki suggests being the only one to pedal while Sakura just sits in her seat. After a few seconds of trying this out, Sakura demands she pedals again, as she feels guilty for not doing anything.
- Team Rocket on Pokémon uses a lot of pedal-powered vehicles. About half the times they use one, Jessie sits back and lets James and Meowth do all the work, which occasionally leads to disaster.
- Two men on a tandem are going up a hill. Once they reach the top, the first guy wheezes out "Man, that hill was a lot steeper than it looked from down there!". The second responds "Yeah, no kidding. Imagine what would have happened if I hadn't been braking the whole time!"
- Robert Fulghum wrote a piece on this. A New Age couple riding a tandem bicycle. The guy in front thinks he's in control 'cause he decides where they're going. The gal in back knows she's in control 'cause she can stop pedalling and look around every so often. A nice essay on gender roles.
- Happens in Jerome K. Jerome's Three Men on the Bummel (aka Three Men on Wheels), the sequel to Three Men in a Boat.
- Occurs in One Fish, Two Fish, Red Fish, Blue Fish. The children have a creature, called Mike, who sits on the back of their bike and doesn't pedal. Subverted, however, in that, while Mike never pedals, he gets off the bike and pushes it up steep hills while the children relax on the seats.
- The Goodies Trandem is a three-man variation. The original version was an ordinary (sic) tandem with an extra seat at the back. Tim and Graeme pedalled, Bill being shortest was at the back in the non-pedalling seat. Later on the BBC prop department actually built a version with three sets of pedals.
- Variation with the Chucklemobile from ChuckleVision, where the two brothers supposedly pedal side by side but Paul never bothers, even though Barry can see him not doing it. (Presumably he's just used to it at this point.) On some versions of the Chucklemobile prop it doesn't look like there even are pedals on Paul's side!
- This happens quite easily in Wii Sports Resort's Cycling game if one of the riders doesn't know what they're doing or refuses to keep rhythm.
- American Dad!: While captive aboard the alien spaceship in "Lost In Space", Jeff undergoes a trial about wether or not he truly loves Haley and deserves to return to her. Unfortunatly, the trial is rigged and only reveals the bad times. One of the images shown about how selfishly he's acted toward her is Haley being forced to pedal a tandem bike by herself... because Jeff is making her lug his van around with the bike!
- Archer: Non-bike example; in one episode, Krieger's van breaks down on the way to bowling night, and Pam is forced to pull the van up a hill while strapped into a harness. Not only are the others not helping, sitting around in the back of the van and drinking beer instead of pushing, Krieger forgot to release the handbrake, making Pam's job a hundred times harder.
- Burns and Smithers on The Simpsons. It gets worse when Smithers gets stung by a bee and begs Burns to get him to a hospital. How does Monty do it? By ordering Smithers to do it, of course.
- Kif and Amy in the Futurama episode "Three Hundred Big Boys". The twist is that it's a flying bicycle, and the pedals power the wings. In this case, Amy is just easily distracted (waving to some friends on the ground below) and wasn't trying to be rude.
- Bender and his two clones in "Benderama", only all three are leaning back. The bike promptly falls over.
- Mr Herriman does it to Bloo in the Foster's Home for Imaginary Friends episode "Let Your Hare Down" when Bloo is attempting to teach him how to have fun and Herriman isn't having a bar of it.
- In the Looney Tunes short "The Dover Boys", Tom Dover is riding a tandem bike all by himself, with Dora Standpipe leaning on the front, which is left up in the air due to Tom being The Big Guy.
- In Tex Avery's "The Bear's Tale", Papa and Mama Bear are the parasites, leaving poor Baby Bear to do all the pedaling.
- In Littlest Pet Shop (2012), Roger escorts the Biskit Twins on a tandem bicycle ride through a park in an attempt to get through to be nicer, and of course, they made no attempt to cycle along with him.◊ Surprisingly, it works, to where they eventually pull a rickshaw for Roger in gratitude.
- The Loud House: Invoked in the episode "Cheater By The Dozen". When following Bobby around town on the McBrides old tandem, Clyde actually asks Lincoln not to pedal because he wants to exercise.