Such as:
'Life isn't a bed of roses you know''
Well, yes I think it is really because roses have thorns - the tough bits of life but they also have the beautiful petals of the flower - the good parts of life...overly simplistic but you get my drift.....
''Oh, I slept like a baby'' - surely this is meant to mean I slept badly but people seem to say it wen they have slept well. Not a mum (yet) but I am an overnight nanny amongst other things so know that babies do not generally sleep well!
Will think of some more I'm sure but in the mean time anyone else think of sayings that don't really make sense?