McClaren's made no sense whatsoever, considering that the majority of Dutch people can either speak or understand English. It sounds funny to us but Moyes speaking with his normal accent would be difficult for the Spanish to understand, in terms of his English. He's also mimicking the English-speaking Spaniards who he must converse with most of his time. That happens.
Naw, I usually speak spanish all day, every day. But occasionally your head just melts and you can't do it anymore. Not many people here speak english well enough to understand, so it's usually pretty funny when I break down into spanglish.