Bill Cosby: The Mark Twain Prize 2009 (9pm, PBS) - Bill Cosby receives the 2009 Mark Twain Prize for American Humor in a ceremony that features clips from his classic shows and tributes from Phylicia Rashad, Carl Reiner, Jerry Seinfeld, Chris Rock, and many others.

New Adventures of Old Christine (8pm, CBS) - Geeky little Ritchie, played by Trevor Gagnon, gets invited to a dance by the most popular girl in school. Ritchie's social boost makes Christine's popularity skyrocket too, and being the great mother that she is, Christine explains to him that being popular is the most important thing in the world.

Mercy (8pm, NBC) - Elisabeth Moss (Peggy from "Mad Men") guest stars tonight as a cancer patient who wants Veronica to let her die. You know Moss is going to act the fool out of that.

Modern Family (9pm, ABC) - Manny displays a talent for fencing, and Jay's fatherly pride stirs up some painful memories for Mitchell. Stick around for "Cougar Town" at 9:30.

Flowers Uncut (10pm, TLC) - A new series that takes you into the intriguing world of flower arranging. Acclaimed designer Jeff Leatham returns from Paris to set up business in New York. And to film a reality show, of course. Back-to-back episodes tonight.

Man v. Food (10pm, Travel) - Adam Richman v. 190-pound burger in Detroit.