* make the cat believe that
Expression used often by Almost Everyone
If someone says something that's so obviously untrue or ridiculous, you can even tell your cat about it because it just makes no sense.
"Ik heb dit examen op twee uur gestudeerd!" "Dat kan niet! Dat maak je de kat wijs!"
"It only took me 2 hours to study for this exam!" "What, That's impossible! Make that the cat believe!"
4 out of 7 Dutch, Flemish speakers have heard this