"I" Is For Intellectual, Inventor, I Thought of That

I...being me.  As in Patty.
Meaning I am the intellectual inventor under discussion today.
Well, the game I invented.
It's called The Alphabet Game.  (I could have been slightly more creative on that title.)
It's a great time killer.

You pick a letter of the alphabet.  For instance, "I."  And you and your group of friends pop some popcorn, pour a round of Cokes and all take turns naming an "I" word.  No repeats allowed.  And it's my personal rule that adding a suffix (-ed or -ing) to some one's word should be illegal but that is always met with a lot of resistance.

So, to demonstrate a practice round:
I might start with "igloo"
         to which one might respond "impostor"
                       and the next would chime "investment."

As mentioned, if you repeat you're out.  And cast into Loserdom.  Which is pretty much where everyone who would play this game started out...
Are your blood cells just tingling with excitement to play?
When you first try getting people exciting to play, you will be met with opposition.  Perhaps outbursts of "That sounds lame" will be heard.  But, trust me, once the ball is rolling... WATCH out!  People are going to get crazy and I will wish you "Good Luck" at getting them out of your house before dawn.

The Alphabet Game (TM) 
Great For:
Birthday Parties
Bar Mitzvahs
Painting Projects
Funerals
Hikes
Long Car Rides
Waiting in Line
Getting Through Contractions (Ken suggested we play The Alphabet Game while I was in labor.)
Putting Yourself to Sleep At Night

So.  Who wants to play?  A word of caution, you are going up against the reigning champ here.

I'll start:
Interplanetary