Probably going to be Lost. I'm 3 episodes in as of 2008 and haven't gone back yet...if I ever do, it will be the longest to get into for me by far.
In seriousness though...As others have said, The Office and Parks & Rec took me about a season to get into.
Arrested Development, I admit, took me a few episodes.
Always Sunny took me about a season...I think just to get into a groove of the style or something, I dunno.
My Brother B&W laser printer is a beast. I've had it probably eight years now and am only, two months ago, on my 3rd toner cartridge despite my relatively low use. That counts the starter cartridge which I am told isn't full.
My Brother color printer on the other hand is a pain. The yellow toner always runs out first and it won't print without it. Well, it can, if you finagle things, but then it only does for like 3-4 weeks. Annoying as shit.
But, overall, better than any HP or Canon I've ever used.