I don't find it creepy, but it bugs me when people do the attention-seeking whilstling - really loud with lots of little trills and flourishes, or if someone whisltes along to a tune I like on the radio. I always think of Roger Whittaker, and the famous clip on 'Jim'll Fix It' with the little boy who wanted to do 'The Mexican Whistler'. Deonstrating at the time probably looked harmless, but when you see it now, it looks like RW is going to ask the lad to come home and see some puppies! Now that is creepy!