Too little, too late, too lame, too impossible.
You should really save your work (to someone whose computer just crashed).
You should really stop smoking (to all smokers, everywhere).
You should limit your alcohol consumption to 5 drinks or fewer per week (to me, for instance, from the CDC).
You should see a doctor about that (to the mentally unwell and people with icky rashes).
You should get your first serve in (to people who don’t from their passive-aggressive doubles partners).
You should learn to forgive and forget (to me, from me)