Just found this one today... the computer asks 20 (or less) questions, and guesses what object or thing you are thinking about.... (of course, i chose a TANK!).... the website is www.20q.net.... here is a sample of my experience....

I am guessing that it is a tank(armored vehicle)?
Yes
16. Is it used in travel? Partly.
15. Do you put things in it? Sometimes.
14. Does it come in different colors? Sometimes.
13. Is it shiny? No.
12. Does it fly? No.
11. Does it bring joy to people? No.
10. Does it have one or more wheels? Yes.
9. Is it more valuable than silver? Yes.
8. Is it motorized? Yes.
7. Is it small? No.
6. Would you find it in an office? No.
5. Can it be used to put things together? No.
4. Is it made of metal? Yes.
3. Is it something you bring along? Maybe.
2. Is it used for entertainment? No.
1. It is classified as Other.

stuipd computer is smarter than I am...

I am guessing that it is a machine gun?
Yes , No , Close
19. Is it dangerous? Yes.
18. Is it larger than a microwave oven (or bread box)? Yes.
17. I guess that it is a hand grenade? Close.
16. Would you use it in the dark? Yes.
15. Is it made out of wood? No.
14. Is it made of plastic? No.
13. Do you use it in your home? No.
12. Does it contain a liquid? No.
11. Would you give it as a gift? No.
10. Would you use it daily? Maybe.
9. Does it come in a pack? No.
8. Can it be chewed? No.
7. Is it made from paper? No.
6. Do you hold it when you use it? Yes.
5. Would you find it in an office? No.
4. Is it shiny? No.
3. Can it bend without breaking? No.
2. Is it used for entertainment? No.
1. It is classified as Other.

:-) This game is WRONG! :-)
I was thinking Machine gun, it claimed i won coz it couldnt beat it in 30 questions, but then it tells me some of my clues were wrong, i think not!
This is what it told me...

You won!
Play Again
Contridictions Detected...
You were thinking of a machine gun.
Is it outside? You said Depends, I say Yes.
Is it commonly used? You said Yes, I say No.
Is it considered valuable? You said Depends, I say Yes.
Is it straight? You said No, I say Yes.
Can you open it? You said Yes, I say No.
Does it involve contact with other humans? You said sometimes, I say Yes.

Ok mr Ai. lets see
A machine gun does not have to be outside!
Commonly used, No you say mr computer, humm, lets see, ever heard of something called the MILITARY!
Considered valuable all the time hey? not when theres 500 others laying on the ground from fallen soldiers.
Straight, nope mr cumputer, these things have rounded parts on them too!
Open it, No you say, last time i checked they can be disasembled and taken apart!
Contact with other humans all the time hey? if other you mean any, then eyt, it does, but you said other, which leads me to believe you mean another person other than the operator, so then i severly doubt there will be another bloke grabbing it while the operator fires! :-)
Deary me, Some people!...err, computers i mean :-)

LOL

I am guessing that it is a tank(armored vehicle)?
Yes , No , Close
16. Does it fly? No.
15. Does it contain a liquid? Yes.
14. Is it white? No.
13. Can you use it to hit something? Yes.
12. Can it save your life? Yes.
11. Do most people use this daily? No.
10. Can liquids pass through it? No.
9. Is it straight? Partly.
8. Does it roll? Yes.
7. Do you clean it regularly? Yes.
6. Is it mechanical? Yes.
5. Is it used for entertainment? No.
4. Is it smaller than a loaf of bread? No.
3. Is it a common household object? No.
2. Can it be washed? Yes.
1. It is classified as Other

Heck.... I'm still smarter than the AI :-)

It never guess I was thinking of an aircraft :-)

I beat it with a Swiss Army knife!