It's much simpler than this. Buy him/her a case of beer. That's all you have to do. Works wonders. People bend over backwards for you after you buy them a case of beer. It doesn't even have to be good beer; you could get some shitty $40/case beer and they will love you. Soma.
Wouldn't work with my crew; one of the IT Security/Systems people brews his own beer. The best thing with us is being upfront and not wasting our time or we will find ways to waste your time.