Cognates - words that sound similar in different languages - can be very helpful when learning another lingo. But sometimes they can turn out to be 'false friends' and mean something completely different. Warning: These contain some examples of adult humour.
Ronaldo - A sty in my eye (English/Spanish)
Pammie - Jump! (Spanish/Portuguese)
Jaime - Bird flu (English/Spanish)
Kristie - Linda? No, Kristie... (Spanish/English)