For me, it is when they make guys look like freaking chicks and I can never tell which one they are.  This goes for Haku from Naruto and some guy from Sengoku Basara whose name I forgot.
EDIT:  Also, chicks with extremely oversized breasts.
						
					
					
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	2 RepliesFanservice. I don't want to see the characters underwear, I want to either see them kick ass or fall in love.