Speculative fiction ignites a spark of the imagination and blazes a trail of exploration throughout the cosmos. So it's only natural for us to pay tribute to the greatest science fiction and fantasy-themed bongs.

Seriously, it's amazing what people can turn into a bong or a pipe. There are R2D2 bongs, Zoidberg bongs, Starcraft bongs, Steampunk bongs and lightsaber bongs. Check out our favorites for 4/20.

Sadly, we have yet to see a tricorder bong, a TARDIS bong, a phaser bong or a sonic screwdriver pipe. Where are you, Star Trek/Doctor Who nerds?

Top image: Thor bong, via Hoveringdog on Flickr.

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Darth Vader bong, via GrassCity.

Yoda Bong, via Hail Mary Jane

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Another look at the Darth Vader bong, via GrassCity.

Purple Lightsaber pipe, via Rollies.com

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R2D2 ceramic bong, via 777Bongs

Alien Bong, via The Rumph

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Bong with pictures of the Millennium Falcon crew, via Glass Pipes

Dr. Zoidberg Bong, via What A Bong

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Pokebong, via What A Bong

Superman Bong, via Tumblr

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Spider-Man bong

Boba Fett helmet bong, via Goddess Sophia Walker

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Spider-Man hookah

Zerg Bong

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High Templar Bong

Tesla Bong

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Batman "Pow" pipe, via ZingiberGlassWorks on Etsy.

Unicorn Bong, via The Rumph

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Dragon Bong, via Vision of Hemp

Dragon pipe, via Hemp Cat Glass

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Pegasus Bong, via The Rumph

"Head of Cthulhlu" pipe via Sword and Sanity

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U.S.S. Enterprise Bong, more at this post.

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Jabba's Bong

Official Gandalf pipe, via LOTR Fan Shop

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Steampunk Alice in Wonderland Caterpillar Bong, via Don't think twice, it's all right.

Elite Steampunk Pipe via BamaPolyBiGuy on Livejournal

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Steampunk Bong via BamaPolyBiGuy on LIvejournal, more at the link.

Steampunk Pneumatic Bong, via BamaPolyBiGuy on LIvejournal, more at the link.

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Steampunk Dunny via BamaPolyBiGuy on LIvejournal, more at the link.

Double-headed Dragon bong, via BongsOnline

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Green Alien Bong, via OzBongs