On your best behaviour

I know someone who, when you meet him in a pub, appears to be one of the most laid-back, casual people in existence. Meet him in his lab however, and he’s a completely different person. Strict is an understatement: you won’t make it within sight of the door if you’re not wearing appropriate clothing and PPE, and woe betide you if you don’t put equipment back in its proper place when you’ve finished using it.