1) Be careful of aliens that appear to be a big pile of goo. Because you just can't trust a big pile of goo.
2) Many people will tell you that if you're abducted by aliens to strike at their eyes. This is wrong. You'll spend too much time trying to figure out which part of them is actually their eyes to have this be of any use. I would suggest trying to convince them that you're too important and powerful to anal probe.
3) Most likely, aliens come in peace. Either that or world domination.
4) Aliens may or may not subsist soley on solar power. Try saying that 3 times fast: Subsist solely on solar power.
5) Remember: Aliens are just like humans. Except for their home planets, physiology, and space travel and mind reading abilities.