never drink milk when eating a mango - it is considered very harmful to health.

also, one should never eat a jabuticaba fruit while drinking milk or alcohol - this is also harmful to one's health.

if a person eats a banana and a mango together, they will get a stomach ache. (paraty)

there is a strong belief that eating pineapple at the same time as drinking milk can be very bad for a person's health. 

it is also a popular belief that mixing watermelon, bananas, guava, and oranges with milk can kill.