A simple but effective warning issued between close friends, when one or both of them have been or are about to go rogue. (Normally accompanied with a quick eye nod and slight raising of the eyebrows!)
*Friend lets off a fire extinguisher inside* "Klaus mate. Klaus"
*Impatient friend wants to leave the smoking area and head back inside whilst you're talking to a hot chick* "Klaus mate, Klaus"
*Friend drops his second pill of the night, 45 minutes after the first!* "Jesus mate, klaus!"
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