So I want to buy my research advisor a nice gift after I graduate to say thanks - he's not only given me my best ever research experience, but has been available for questions on many, many topics (quantum, thermo, relativity, anything physics), has helped me immensely in graduate school applications, has written dozens of letters of recommendation, offered encouragement and advice, etc. He's done a LOT for me academically.
He really likes scotch so I was thinking about buying him a really good bottle of scotch, but what do you guys think? Is that tacky? What else could I buy? Have you ever bought your advisor a thank you gift, and if so, what did you buy?