Harry realised that Marietta had been looking at them all from between her fingers, when she suddenly froze. She didn’t appear to be listening to Umbridge as she slowly lowered her hands to just below her eyes (the top of the pimples on her face coming into view), so that she could stare at Harry in horror. Harry used the moment to play up the condition he was in, peering back at her blearily and wobbling gently in his seat. Her eyes widened a smidge, and he knew he had her.