I definatly wasen't planned and neither were my brother or sister, my mother had her tubes tied after me, since my dad was 27 when I was born and you have to be 30 or over to have the snip, so they couldn't have more kids. My parents defernatly weren't prepared for us, neither did they get along, but I always make jokes that if they had 3 kids, and made sure they couldn't have any more, they must have been getting along alright at some point.
Also I pissed off my manager, when I was still worked for HMRC, after she told us she was pregnant, and it was an accident, by saying 'If you don't want it, there are some stairs over there I'm sure you could 'accidently' fall down.' Thankfully she laughed and understood that it was a stupid joke, I think by then everyone was used to the really stupid things I used to say.