For example, when I was pregnant a well meaning friend said something like "Oh I wonder what tv characters the baby will be into", I threw my head back and laughed claiming MY child wouldn't be watching enough tv to even KNOW characters. It would be only books, learning tools and nature tables in this house.... yeah 
I also used to have an inner high and mighty feel when I would see people with young children in McDs, until one day I got a glare from a pregnant woman and her partner when popping DD into a highchair.
I texted my exes sister ranting about him after we had split up, so unreasonable, I am cringing in a ball here remembering it!
When I was pregnant I had a "birth plan" in my bag saying offer me no pain relief whatsoever, fair enough each to their own and I genuinely had the best intentions but I had every pain relief available and even offered money and produced my purse for the epidural 
I often look back and shake my head in disbelief at my 23 year old, heavily pregnant self with all these notions (and sometimes judgements
)
Surely I can't be alone, me times YOU were unreasonable