Depends, if someone is filling it and stops, half full. I drink half of it and stop, half empty. ^_^
Also, my glasses are very rarely at halfway, if there is water in my glass, it is only there until I have a free second to drink it all down. I tend to drink enough water that my table gets a pitcher of it at restaurants, and at hom eI tend to drink 3-4 gallons of water a day. Hmmm, water. <runs off to get another glass>

If it was drank down to that point; glass = half empty
If it was poured up to that point; glass = half full

ah, I wish there was a 'both' option on this poll...

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I hear you say "Why?" Always "Why?" You see things; and you say "Why?" But I dream things that never were; and I say "Why not?"

Always full, there is air in it.

This explains so much...
http://www.youtube.com/watch?v=G5WNfomqR6I

If I see a glass at half I would just say 50% capacity, just to throw off those who would ask this age old question.

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very true the glass contains 50% water, ~40% nitrogen, ~20% oxygen, ~1% co2, ~0.3% noble gas like helium and argon; that composition is by volume.
by mass it's ~90% water

I find it hilariously coincidental that 6666 people claim humans aren't at the top

What are the chances, eh?

I didn't notice . Wow, it's interesting. Eh, what is the meaning of the last "6" after Satan's number?

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its cold down here fam ~

half empty... does that make me a pessismist?

i automatically assume that if you were to fill up a glass, then fill it right the way up. why would you do things half way? thus, the thought of it being half full rarely occurs to me.

Glass of water is...

There should have been a third option. Both.

the devil made you say this!!!!
guess he is really on top of us all. and that 6 times!
6x666

really the perfect number to stop this poll. very ironically.

PS: i cant vote for the glass poll. even tho its a fun poll i use both expressions. depending if i am about to fill the glass or if i emtpy it.

That's why I voted "were we ever at the top"
the food chain isn't so much of a chain as a food web.

What glass?

Neither... The glass is two times largers than the amount of water in it.

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May the Chocolates of Heaven be on your side.