Improved proverbs No. 1: 'You can't both keep your cake and eat it'

This is often not understood; probably because the 'have' in the original ('You can't have your cake and eat it') is ambiguous - since having a cake can mean eating it.

And the proverb is the wrong way round: actually you can (...first...) 'have' your cake and (...then...) eat it - plus the phrase really needs a 'too' or 'as well' at the end.

Thus: 'You can't both keep your cake and eat it'.