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The RULE: In order to solve it, you are allowed only to ask me yes/no questions. And I may answer only No, Yes and Run-time error (in case neither Yes nor No fit).

Here's the riddle:

A little girl and a little guy were walking and suddenly wanted some peach juice. The girl said: "I want two glasses of peach juice". The guy said he wanted one.

They go to a bar and the boy buys five glasses of peach juice, but takes only three glasses, leaving the other two on the counter.

He gives two glasses to the girl, as she asked, and takes one for himself (as he wanted).

QUESTION: What's the matter? Why did he do so?
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Comments  
1) Is he crazy?
2) Is his girl fat?
3) Did he notice his friend in the bar?
4) Who must pay the juice?
1) Is he crazy? — No
2) Is his girl fat? — Doesn't matter.
3) Did he notice his friend in the bar? — No.
4) Who must pay the juice? — Don't know who must, but the boy paid, as any gentleman would. This wasn't a yes/no question BTW...

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EDIT:

I think that Russians a more likely to solve this riddle because it is of Russian origin.

As for me, I was asked it in a train when travelling to Crimea from Moscow. It took me (and two other guys in the roomette) about three hours. Add to that that most of us felt sleepy and you'll get a good estimate.
Teachers: We supply a list of EFL job vacancies
1) Was it only possible to buy glasses of peach juice in multiples of five glasses?
2) Did the boy have a coupon for 5 glasses of juice?
3) Is it the case that the boy could only carry three glasses at a time?
1) Was it only possible to buy glasses of peach juice in multiples of five glasses? — No.
2) Did the boy have a coupon for 5 glasses of juice? — Now he paid with cash.
3) Is it the case that the boy could only carry three glasses at a time? — No.

Hint: instead of enumerating possible answers, you can ask anything that you think may help to get closer to the solution...
Did the boy receive any change when he paid?
Site Hint: Check out our list of pronunciation videos.
«Did the boy receive any change when he paid?» — Yes.
I give up!
It's too soon to give up, Prez! Emotion: wink

Were the glasses bigger than the boy and the girl wanted?
Did they want to save the other two glasses for later?
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