I love humorous threads. I'll never forget when LDB and I lurked on this site for a few weeks before we joined...There was the thread about making your own Watchtower cover spoofs. I laughed so hard, tears were rolling down my face. We really needed that laugh at the time. I still enjoy the laughs from this board.
I also enjoy medical-related topics (that's the nurse in me.)
I hate to join a topic that's more than about 3 pages long if it's a deep discussion (ie evolution vs. creation, atheism vs christianity, etc.). I'm afraid if I didn't read every single post very carefully before I join the discussion, I'll get trampled on for misunderstanding, misconstruing, and so on.
Most topics that start out VERY long and drawn out are not likely to get my attention. (Does this mean I have a short attention span? )