a very sensible belief is not to eat puffer fish - this has been proven scientifically, and puffer fish can actually kill if not prepared correctly (mangaratiba).

for kitchen chefs who regularly chop onions, some people think that placing a piece of bread on the tip of the knife while chopping the onions will prevent crying (paraty).

while cutting onions, a cork in a person's mouth is thought to prevent burning eyes (paraty).

if a child drinks too much water before playing, he could get cramps - to prevent this, some people think that if a parent wets the child's forehead with water, the cramps will not appear (paraty).