My favorite card games has many names (some of which shall not be mentioned), but around my neck of the woods it's most often called 'oh poop'. Frankly, I don't even like to say 'poop' so I call it Trix. I found a place you can play it (along with some other card games) online. On that site it is called 'oh hell' and the rules are not as fun as the way we play. In any case, it's a fun game.
What is your favorite card game?