In Mexico, people use a typical but informal expression to say 'Be careful'.
This expression is very similar to 'Watch out' or ‘Beware’. It’s only one word,
‘Aguas’. The literal translation in English is ‘Waters’. If you are in Mexico
and you hear to someone to say you ‘Aguas’, it means you need to (look/watch) out
for something. An example would be ‘Aguas con el coche/ Watch out for the car’.