* Does he ask the same, tired questions others ask (at a rate of once or more per minute)?
* Does he clearly lack the ability or inclination to ask the almighty Google?
* Does he refuse to take the time to ask coherent, specific questions?
* Does he think helping him must be the high point of your day?
* Does he get offensive, as if you need to prove to him why he should use Ruby on Rails?
* Is he obviously just waiting for some poor, well-intentioned person to do all his thinking for him?
* Can you tell he really isn't interested in having his question answered, so much as getting someone else to do his work?