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1.
Skiing: A small lump of very hard snow or ice that looks innocent enough but it is practically welded to the piste causing you to stumble when you ski into it. Usually encountered first thing in the morning before the sun has loosened the snow up.
Following a wipe-out....."I think I must have hit a space cookie or something"

OR

Take it easy guys this next bit is littered with space cookies
by brucester September 10, 2006