And that's exactly what happened in the last 30 seconds of Arrow's "Time of Death" episode when, as Felicity (Emily Bett Rickards) babbled adorably about being his girl (but not his "girl-girl"), Oliver (Stephen Amell)gave her a pitying look.
With that look, Felicity was transformed from an unsteadily sexy computer wiz with moxie (and a puppy-love crush on her hero boss) into a piteous creature.
Now, before anyone gets all up in arms that I seem to be criticizing the talented Amell (and he is, him and Rickards, and David Ramsey and the rest of the cast, and crew, and writers etc. are why I watch the show -- I'm not normally big on comic-inspired shows), let me assure you that I'm not. That look was right for the scene as written, it's just that the Felicity-Oliver story arc went awry halfway through the episode.
But I'm getting ahead of myself. That moment wasn't the only misfire in the episode.