Well, I might as well as join the band wagon on thoughts of things I wouldn't do before having kids.
This will probably be a short list.
1. I never thought that I would let my child sleep in my bed with me.
2. I never thought I would intinctively catch barf in my hand. (This happened several times, once was while I was eating dinner, I simply wiped my hand off with a napkin and continued on with dinner not missing a beat)
3. I never thought I wouldn't have a college degree before having kids.
4. Never thought that having kids would interfere with my sex life. ;-) ha ha ha ha
I guess that is basically it. Told you it wouldn't be much. I don't think guys think a whole lot about kids before they are married.