Fun Brains Do You Know Any Fun Brain Games/teasers To Share With Family And Friends?

Do you know any fun brain games/teasers to share with family and friends? - fun brains

My friend knows a game in which the use of spoons, knives and a "number". tried to estimate the number, but the trick after the devices, which show a number with your fingers gently. Its fun to play and watch people fight. Does anyone know another game like that? or something similar?