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Thanks, guys, great answers ! There are obviously some smashin' folk on here!
Hate to pick out ONE reply, all great, but, ummmmmm, yours about rushing up to your teenagers in the street cracked me up!
The nearest I got to that was when he was about 15, and parents had to go to the school to discuss a forthcoming exchange visit by German kids and when the question of language came up I quite unthinkingly said, "Oh, our visitor will be alright - I've studied German - I can speak it." What a pi!!ock of a thing to say - my lad visibly shrivelled up before my eyes - I learned a lesson that evening! (no pun)