Before anyone starts bashing, I love DSD (7 years old) and think 90% of the time she is great. I don't really discipline her, I leave it to her dad but occasionally I do have her on my own but she's started to be really cheeky when DP isn't around.
For example, DP went into the shop and DSD is sat in the back, she leans through the headrest and playfully pulls my hair calling me "lady elephant" over and over.
She definitely knows that I've never disciplined her and left it to her parents but I'm not having a 7 year old saying whatever she likes to me when her dad isn't around.