Ok, haven't exactly thought too much about it. I'll tell you in order from getting it I guess.
I will:
Be excited about it all the day before and be shaking from the awesomeness and be loving the update even if it were less exciting. I'd have a smile engraved on my face. That night I'd be so excited that I wouldn't even sleep, I'd be more excited on that night than Christmas lol. (Well, maybe not more excited than christmas) I'd wake up saying, "Today's Brawl!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" and ask when we could go to get it. Unless it were on a Tuesday.
Go to where I'm gonna buy it and see if they have it and try until I find it. (If I can't find it then I'll try again the next day or something.) Then I'll stare at the box in the car until I stop crying, turn front to the back and cry a little more, then stop crying and look inside the box and stare at the top of the manual and squeal a little. I'd then look in the manual and study every picture to savor and possibly cry more. Then drive in the driveway and go inside to re-open the cover. Take out the disk and stare at it and go through the emotions.
1. I'm going to go into shock and almost pass out from excitement.
2. Snap myself out of it then cry tears of joy and squeal some more...
3. Slowly put the disk in like slow motion and turn on the Wii and cry some more.
4. Click on the disk channel screen and stare at the screen for an easter egg... Not really lol.
5. Click start and squeal the entire loading screen.
That's just the basic emotions lol. I look at the screen and go to the starting screen and start going mad with happiness about Sonic in Brawl and then take a step back and go to the phone and call my friend who's definitely getting Brawl. If I can reach him then I'd get him on Wi-fi and turn on a stock match and choose our favorite starting characters and just talk about how awesome the game is and pretty much hang out on the stages, not even doing a real match. Not until later. After that I'd get off and play SSE (If SSE is online co-op I'll play with friend) until crying is impossible to do because I've used all of the water in my eyes. I'll probably play SSE for a long long time until I get tired or I'm just told to get off and go to sleep. That night I'd be so excited that I'd dream Brawl.