Never could grasp basic firearm safety.
Since you brought up the subject, I can't tell you how many people I've pissed off by pointing out they 'failed the test' when they hold their 'gun mug' improperly (lousy gift idea, imho, unless it's for 'training the recipient's trigger finger').
Loved that scene in Ronin where Sam (DeNiro) 'ambushes' Spence (Sean Bean) with a 'coffee cup'.