Alternative form of you could have fooled me

A person who does not plan ahead and think matters through becomes involved in risky or unfavorable situations which prudent people avoid.

Alternative form of you could have fooled me

After being tricked once, one should learn from one's mistakes and avoid being tricked in the same way again.

There are consequences to not wearing a condom on one's penis

It is easy to get money from foolish people. / It is difficult or unlikely that foolish people maintain their hold on acquired wealth.

What you now tell me is true I thought was false, or I nonetheless think is false; I don't believe you.

Foolish people repeatedly do foolish things.

plural of foolscap

Alternative form of fool's cap / (strictly) Writing paper sheets measuring 13.25 x 16.5 inches / (more usually) Such a sheet folded or cut in half, thus approximately 8 x 13.25 inches.