Tube Travel

An unusual form of getting around, primarily found in video games. Hop in one end of the tube, get shuttled through in some manner, and come out the other end. Instead of taking a direct route, the tube may take a complicated snake-like path to the destination.

Examples:

Literature

In EE Doc Smith's Skylark series, the largely-aquatic humanoids of Dasor use systems of pipes filled with rushing water as their mass transit system.

Multiple Media

In Bionicle, there's the chute system of Metru Nui.

Music

City Hall by Tenacious D has this as one of the decrees of the "Two Kings":

The second decree: no more pollution, no more car exhaust,

or ocean dumpage. From now on, we will travel in tubes!

Get the scientists working on the tube technology, immediately.

(Tube technology.) Chop, chop, let's go!

Video Games

The Jazz Jackrabbit series has these, most famously in the Tubelectric stages.
The warp pipes in the Super Mario series are iconic. However, in some cases (such as the warp zones) you appear to be teleporting instead of traveling a path. The latter was never clearly shown in the games until Super Mario World.
A Link to The Past has this in the Turtle Rock dungeon.
Clyde's Revenge has this starting with the eighth level. It is possible to go through the tubes in both directions.
A frequent method of travel in Strider for the NES.
In Shin Megami Tensei Nocturne, this is how you advance in the Bonus Dungeon complete with a Nifty Mini Game
In the game Alpha Centauri, the technological advance of Monopole Magnets grants tube travel to your faction.
Happens in Kirbys Epic Yarn, where Kirby unravels into a single, long piece of yarn and travels through tight spaces in a few levels. You can control moving forward and backwards, as well as move left or right when the path branches off.
Drill Dozer has many threaded tunnels that require drilling one way or the other to enter and navigate. Defeating the boss of Area 5 involved being able to navigate tunnels within a time limit.
Very common in the Sonic the Hedgehog games. Sonic the Hedgehog 2 has it in the Chemical Plant and Metropolis Zones, Crazy Gadget in the second Sonic Adventure game, Secret Base and Egg Rocket in Sonic Advance, and others.
Cave Story has one, though it isn't important to the overall gameplay. It just there to help you get out of Plantation's water reservoir faster (possibly in case you fall in without the jetpack equipped).
Earthworm Jim 2 had this in the ISO 9000 level, though it looked painful (the entrance was a grinder).
Happens briefly at one point in Portal.
- Is built up on more in Portal 2. Tube travel is the main way everything in Aperture Science gets into test chambers, it is ridiculously inefficient and expensive, and there are so many props in the facility that no one even cares.
Mr. Gimmick has these.
Command and Conquer Generals features the Tunnel Network for the GLA, which involves building separate entrances that are somehow magically connected the instant the Tunnel entrance is completed no matter the distance or location on the map.
Starcraft: The Zerg have the Nidus Canals, which act in the same way as the Tunnel Network as mentioned above.
Sackbots are transported this way in Little Big Planet 2.
Cosmos Cosmic Adventure has these, though it's a bit odd since the pipes look too thin for Cosmo to fit.
F Zero X and GX have levels where you are in a tube, and on the outside of a tube.

Web Original

This is how John Freeman gets into GLaDOS's chamber in Djy1911's adaptation of Half-Life: Full Life Consequences.

Western Animation

Futurama has the Tube Transport System.
Spoofed in "Rocket Squad", a Looney Tunes parody of Dragnet set in space, where the pneunatic tube system provides a bumpy ride for Daffy and Porky, with the latter remarking how people used to use elevators.

Real Life

Some playground and water slides are like this.
Pneumatic Tube systems (AKA "the things in bank drive throughs", though some larger people movers have been made). Likely an inspiration for at least some of the above examples.