She makes a face at him like a snide cat, all scrunched up and annoyed and put upon. It is only 10% genuine disgruntlement, the remaining 90% is habit.

"I will punch you in the leg," she threatens half-heartedly. His leg happens to be near eye level and something about an injury, limping away. He could threaten her shoulder in the same way but he is a better man than she is so she doesn't suspect it is likely.