A man and a woman are driving in the car. The woman is chattering about the relationship and how she really feels things are going well in such a short time, yada yada, while the guy is distracted by car trouble. She's going on and on and he finally pulls over, right in front of an "engagement ring" store. She immediately accepts and calls her loved ones on the cell phone while his facial expressions indicate he's trying to dig himself out of this hole.
Maybe I spend too much time on this board, but I think this is an easy one to relate to Ehell - Don't accept a proposal until someone actually proposes!