1.  Asking "When's the baby due?" . . . when she's NOT pregnant.  26% of people said this is the worst thing you could say. 

2.  Answering "Yes" when she asks if her butt looks big. 17%.

3.  "You look tired."  13%.

4.  "Calm down."  12%.

5.  "Do you need help parking?"  11%.

6.  "You look more like your mother every day."  8%.

7.  "I told you so."  5%.

8.  "How much did you pay for that hairdo?"  4%.

9.  "Should you be eating that?"  3%.

10.  "Don't you have some vacuuming to do?"  1%.