Mentioning Mimi and Papa and Grandpa

We have a slight problem - it's called a Mimi and Papa and Grandpa addiction. Here's the deal - we are headed to Charleston for a weekend with my parents (Mimi and Papa) and a Sunday with Lee's dad (Grandpa) at his new place. We can't wait to hand Jack off to the grandparents and watch some much anticipated football. I was having a hard time getting Jackson to settle down and get ready for a nap today so I mentioned that when he woke up he would get to go see Mimi and Papa so he needed to take a nap right now. That got his attention and he went right to his crib but now he is just sitting in his crib yelling "Mimi!! Papa!! Bapa!!! Mimi!! Papa!! Bapa!!". I guess he thinks that they are here now - boy is he in for a letdown. We still have a 2 1/2 hour drive - I'm praying for a nap so that our ride will be that much more enjoyable. Remind me not to mention the grandparents until we are 5 minutes away, please.