In May 2006, his report on the viewing of online pornography, among other lewd and lascivious behavior in Cleveland-area public libraries, managed to draw widespread attention on the Internet. Numerous sites posted a link to the video clip for its perceived comedic value. In the report, Monday confronted Berea resident Michael Cooper, who was caught on camera masturbating while viewing pornographic images in the library. Monday elicits denials from the resident and uses an unemotional deadpan speaking tone when describing the resident's acts, before revealing that he in fact taped the acts. Monday drew criticism on his blog from people who saw the report.
The notoriety stemming from the library report led to the Dunedin Blue Jays holding 'Mustache Monday' on August 8, 2006. The promotion allowed any spectator with the first name 'Carl' or any form of 'Carl' (Carla, Karl, etc.), a surname which doubles as a day of the week (as does Monday), or those sporting a mustache to receive discounted admission. The game was postponed after lightning struck a transformer, causing a power outage.
The library piece was satirized on September 28, 2006 by Comedy Central's The Daily Show in a segment where correspondent Jason Jones put on a trench coat and attempted an ambush interview with Carl Monday. The piece ended with Jones catching up to Carl by staking out his house and asking him questions like "How do you kick a man when he's down?" in Monday's style. The segment was entitled, "Rubbing Out Crime"  Monday responded in a statement on his blog.
Carl Monday grew up in Cleveland's Slavic Village and moved to Garfield Heights. He attended Garfield Heights High School. In high school, Monday started investigative reporting by leaking the roster list of the Garfield Heights High School Bulldogs baseball team. The coach of the team was not happy with this leak. Monday had found the list on the floor of school's hallway and decided to publish it in the Mirror school newspaper. Monday is a 1973 graduate of Kent State University.
- Colby, Edward B. (2006-07-04). "Carl Monday On Relentless Reporting, a Murder Confession and His Real Name". The Water Cooler (Columbia Journalism Review). Retrieved 2006-09-25.
- "Beware The Power Of Carl Monday". Deadspin. 2006-08-08. Retrieved 2006-08-25.
- "'Daily Show' features Carl Monday". WKYC. 2006-09-21. Retrieved 2006-09-28.
- Carl Monday: Carl Monday, Meet Jon Stewart