I dont believe in the 'terrible two's'. Nope, I would call it the 'trying two's' because both of you are trying to figure out how to make life at comfortable as possible. The problem comes when one's comfort clashes with the other.
When I had this problem with my third child, he would sit on the floor of the car or on the ground spot where I could not close the door. I could have just screamed, but I would calmly tell him that we had to go. Of course that did not work very often. Then I would stand there and wait. I would answer his questions with "When we get to go inside, you will see." I might have sounded like a broken record, but I would not satisfy his requests until he met my requests. He would say, carry me. And I would calmly refuse. I would play the waiting game. Finally, he would get up and sometimes he might start crying, but he would walk.
I would carry an umbrella stroller in the trunk, just incase I just didnt have that kind of time. The rule was if you start the trip in the stroller, you stay in the stroller the entire time. Sometimes he would choose the stroller and fall asleep, other times he would choose to walk.
Yes, there may be tears, but I would offer him time to recompose himself. Only once do I remember feeling so embarrassed because he started throwing a fit on the way back to the car, but that trip even I was exhausted! (Christmas shopping changed after that day)
Glad to laugh about it now,
M.