Some favorites:
"The Hardest Part of a Zombie Apocalypse Will be Pretending I'm Not Excited"
"He looks like you, but he's got messy hair..."
"Jews for Baltar"
"Anyone seen my right to Habeas Corpus?"
"All Glory to the Hypnotoad"
"Warren Ellis is the Internet Jesus"
"Dr. Kenchy Duhwalia Needs to Stop Being Such a Pussy All the Time". (I made this one; a Jericho fan group).
"Kurt Vonnegut is not dead, he is just in chrono-synclastic infundibulum"
"Siler should be promoted."
"God - A series of tubes." (Another one I made in honor of Battlestar Galactica: Razor's Prime Hybrid).
"I can't turn my back to a dark, empty room because Ben Linus will eat me."
"I Saw The Mist And Now I Can Never Be Happy Again"
"I'm in your {noun}, {verb}ing your{noun}"
"The Winchesters are the Reason Waldo Is Hiding"
"The Fire-Captain Beatty Support Group"
"Jim Beaver has the heart of a demon. He keeps it in a jar on his desk." (I made this one in honor of Beaver, star of Deadwood and Supernatural.)
"How in the name of all that is holy does Adebisi keep his hat on?"
"Emma Frost Is A Total Loser Club"
"Sex is for Smarties!"
"Richard Dean Anderson is the Spring From Whence All Life Flows"
"Duck Hunt Is The Root Of All My Homicidal Tendencies"
"What the hell happens if you walk through the back of the Stargate?"
"Everything I Need to Know About Foreign Relations I Learned From Spider-Man"
"We Need to Invade Other Planets to Survive"
"I want to rule a small latin american nation with an iron fist"
"'A.A.A.A.A' American Association Against Acronym Abuse"
"God Hates the Westboro Baptist Church"
And I have at least two or three Facebook groups created in my honor.