Was at a Van Gogh exhibition at the Clark Museum and was just awestruck by "Landscape at Auvers in the Rain". I couldn't stop staring at it. (Embarrassingly, at one point I actually reached out toward it. I swear I wouldn't have *touched* it, but the guard politely asked me to back up a bit, sir.😬)

I was politely told to back off at the Frick once.

(Since then, sometimes at a museum I firmly stick my hands in my pockets.)