I heard that my friend said "Chao Pescado!", but is there any other funny way to say "Good-bye" in Spanish?
前に友達が「さよならサカナ！（直訳）」って言ってるのを聞いたんですけど、
スペイン語でほかに「さよなら」を言うのに面白い言い方ってありますか？

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When we are trying to say "see you later" in a funny way, my friends and I usually say "nos vemos al ratón"

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I once heard that during a meeting in California, the chilean president played jokes saying goodbye to Schwarzenegger with his own well-known "hasta la vista". LOL   
I guess sense of humor goes beyond languages, so feel free to say good bye your own funny way.

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"Hasta los huevos" (不相応な成語) instead of "Hasta luego".
"Me piro", "me doy el piro"  "me las piro", "me piro papiro" (行って来ます、パピルス君) o "me piro vampiro" (いってきます、吸血鬼君) instead of "me marcho" (行って来ます).

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Here some girls say sometimes "Chaolin" instead of "Chao".

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I have an excellent one: NOS PILLAMOS!