In Spanish, many words can sound the same but depending on how they are said can have completely different meanings. "pero" is the word for "but" and the same word with a double 'r' "perro" means dog! A person who tries to order the following in a Spanish restaurant "chicken but no sauce" can often end up asking for "chicken, dog, no sauce" which may cause a bit of a tense moment with the owner! (This actually happened with a friend of mine in Mallorca!)