I notice people with kids much more frequently now. I do not know whether there is a causal link that can be traced to my own pending fatherhood or not, but I am assuming that there must be. I particularly notice parents of kids whose kid is in the midst of a temper tantrum, crying uncontrollably, or other such incidents of typical kid-like behaviours.
I am generally trying to work out how I am going to respond. I guess this is because I am certain that when the Kid is being well-behaved he will be Mommy's boy and when he is acting up he will be Daddy' boy and I will be the one responsible for disciplining the little fella.
I have had plenty of practice with the nieces and nephews and with other people's kids. So, I am quietly confident that I am going to be able to handle the changed sleep patterns and the general lack of sleep. As Big John McCarthy of UFC fame was known to say, "let's get it on!"