markofkane,
Some of the responses you experienced are canned responses from the "Halbrain.dll" file. Here are some others.
Me: You forget
I don't forget anything!
Me: 2010
Hal: I feel that my performance in that movie wasn't quit as good as in 2001.
Me: Calculate
Hal: I was never too good at math.
Me: Alcohol
Hal: I have been clean for a year now. Don't get me started again?
Me: Frisbee
Hal: I tried using a frisbee one time, but I didn't have the hands for it.
Me: Zit
Hal: Don't worry? Some zit cream will clear that right up.
As for "poof" Hal interprets that word via his built-in dictionary.
=vonsmith=