Anime series that keep you hooked

I have a question to all hardcore anime watchers here.
I've watched about 5-7 full anime series ever because everytime I start watching one I get bored after 1 or 2 eps. Latest one I watched was Ichigo Mashimaro and I only watched half of it because I couldn't find subs for episode 7-12. I found it to be pretty entertaining and "easy" to watch. Other series I've watched are Hellsing, GTO, Azumanga Daioh and R.O.D , all of them were decent atleast and kept me hooked enough to watch them. So hit me with your recommendations of anime series that won't bore me to hell and make me stop watching after the first episode.

Thanks for all the recommendations, I'll check them all out as my time allows.
I just finished watching FLCL and it was indeed fun and entertaining. A bit too random at times but that didn't detract much from it. Very action-packed, you hardly had any time to get bored. As soon as you thought one of those 10 minute moments with just garbage, as often seen in other animes, would come, it just jumped right into the action again. I guess it's a tradeoff you have to make. Randomness vs drawn out boring scenes. Also, I loved Mamimi's voice, a shame the voice actor hasn't done more anime work.
A question to everyone who watched FLCL. Just after watching the last episode I was struck by strong feelings of sadness, which soon passed. Am I a huge fucking faggot or what is going on?