solved

dinner done...  sister transferring leftovers to a plastic container...

me:  'use the glass!'

sister:  'they're too big...'

me:  'that's ok...'

sister:  'there's no more space in the ref...'

me:  'wait...  i'll wash a smaller one...'

sister:  'this will do...'

me:  'no...  if there's glass, use glass...'

sister:  'don't bother...  i'll just eat this...'

and she did...  : }