The One Where Monica Sings - S9-E13
Corrected entry: In the one where Joey gets his eyebrows plucked, after Chandler has plucked his other eyebrow they decide to curl Joey's eyelashes. Chandler puts the eyelash curler toward Joey's eyes and looks, to all intents and purposes, like he is curling Joey's lashes because he stops moving, however, Joey is continuously blinking his eyes. If Chandler actually had put the curlers on Joey's lashes, the continuous blinking would have ripped every lash from that eye.
Correction: There's no mistake here. Exactly because Joey is so visibly blinking, it's very clear that Chandler is waiting for him to stop before he curls. The curling tool (or whatever it's called) is obviously not close enough to Joeys eyelashes and we are not supposed to believe it is.
tw_stuart