Esoteric programming languages are programming languages which are designed as a proof of concept, or as jokes, and not with the intention of being adopted for real-world programming. Consequently, usability is rarely a high priority for such languages. The usual aim is to remove or replace conventional language features while still maintaining a language that is Turing-complete.
The earliest esoteric language was Intercal, designed in 1972 with the stated aim of being as fundamentally unlike any existing language as possible. Other noteworthy esoteric languages are (for a more complete list, see List of esoteric programming languages):
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(all links here are dead, anybody have some new ones?)