And when I mean aliens I mean proper aliens, not stupid Close Encounters grey aliens.
What would your reaction be if any one of the following was discovered:
1: Alien bacteria or other primitive life.
2: Alien advanced plant and animal life
3: Primitive alien civilisation
4: Alien civilisation equivalent to ours (Friendly)
5: Alien civilisation equivalent to ours (Hostile)
6: Alien artefacts or 'post-civilisation' (Actual aliens gone but robot servants or neural network with AI remain)
PS: As for the likelyhood of aliens, this little calculator ought to help:
http://www.seti.org/science/drake-calc.html
I put in some not-so-optimistic numbers and got 367.5 communicative civilisations.