What's a car ride?

A couple of days ago the hubby was making a quick trip to the store to pick up some milk. Not wanting to drag the whole family along, he quietly got dressed and ready to go. Our youngest son who is 4 spotted him and asked if he could go. The hubby agreed. He did not want to take all the kids (who can blame him). As they were getting ready to leave Bob asked the hubby where he was going. The hubby replied "we are just going for a car ride" (not wanting to say store because then all the kids would be asking to go). Bob had a confused, blank expression on his face and after about 30 seconds said "Dad, what's a car ride?" Whoa. The hubby and I looked at each other wondering if that had just happened?!? The hubby spoke real slow and explained what a car ride was. Bob got frustrated and said "that's not what I meant...I thought maybe it was something special." Ha ha ha. I guess the next time I get in a car I'll have to savor the experience. I just don't understand sometimes...