A Mum at playgroup had a bf, and I STARED like a yokel having heard so much about them but never having seen one 
Then furthered the uncouth look by soon after whipping a boob out happily before some else did...then comparing latches in a group.
Poor Mum with the cover looked awkward and I felt awful, honestly pre MN with other babies I probably wouldn't have realised what she had.
Was a bit 
though at the mother who asked if it was my baby I was holding and feeding!