Ok, I have some serious questions about alien encounters. I figure we can't be the only planet in the universe that supports life, so...

1. How do you know when you've met an alien?
2. Do they walk among us and look like us, or are they little green/grey/pink and purple-spotted non-human-shaped blobs?
3. Are they benevolent, malevolent, bureaucratic, or just not interested?
4. Any tales of encounters? What was the overwhelming feeling afterwards?

All contributions welcome.