Years ago I had a simple KEYED flute, just like the "Irish" flutes, except the 6 holes which are usually open had keys. It worked very well, and had a good loud tone. But the keys were always sticking, so I used to carry a little packet of talcum powder and some Rizlas to unstick them.

One session, I felt a key sticking, reached in the case for the talc, sprinkled a bit on a paper, and.... "Oi sonny, I'm a police officer..."

He took quite a bit of convincing.

So now you know. If you like your cocaine warm and flat, come to Britain!