Chuck Norris Facts were originally seen on IRC, and on websites like the Something Awful forums, in early 2005. Conan O'Brien's Chuck Norris jokes on Late Night with Conan O'Brien (which generally center on Walker: Texas Ranger) have been seen as an inspiration for the fad.
Chuck Norris Facts are an Internet phenomenon of satirical "facts" about martial artist and actor Chuck Norris. The "facts" tend to involve absurdly exaggerated claims of Norris' toughness, attitude, virility, and masculinity stated in an absurdly serious tone; for example:
Chuck Norris' tears cure cancer. Too bad he has never cried.
If you can see Chuck Norris, he can see you. If you can't see Chuck Norris you may be only seconds away from death.
Chuck Norris does not sleep, he waits.
https://en.wikipedia.org/wiki/Chuck_norris_jokes