Possible Breakthrough?

We had another busy, but fun day today. I took it upon myself to finish cleaning out the bathroom hall closet today (it looks awesome), as well as get caught up with the laundry and water the newly-planted garden. Mark lowered Ethan's mattress (so he won't take a header right out of it when he starts standing on his own soon) and did the dishes. We also just spent the day hanging out with Adam and my family. My grandparents had a get-together up at their place this afternoon, so we went up there for a bit. It's good to see almost everyone up there. I made my world-famous Thai Chicken Salad, which was delicious (as always). It was slightly frustrating because Ethan wouldn't take his afternoon nap while we were there. He gets very distracted when there are a lot of people around, so after being passed around and spending some time outside, he did finally get a little tired. My parents ended up sitting with him for a little bit and then putting him in his car seat to fall asleep. We left shortly thereafter.

Mark left a little while later to see "Terminator: Salvation" with Dad, Travis, & Keegan, and Adam left to have dinner with his aunt and cousin, so that left me and Ethan alone to hang out. Things were pretty standard until he rolled over on his belly. So far, he's tried to crawl but can't get moving-either he tips over, or he belly flops to the floor. Well, not tonight. I set my phone on the floor close to me (so I would see/hear if anyone called). Ethan started "army crawling" on his elbows to get to my phone. Thinking it might have been a fluke, I tried it again. And again. And again. Same result everytime. WOW! So, he might crawl after all. My only question is...why does he seem to have all of these milestones happen when Adam is home?