wanzippo

What is a good, creative thoughtful gift that I can get my boyfriend for our four year anniversary?
In the past I have bought him a engraved Zippo lighter, a glass beer stein with his family crest on it, and expensive cologne.
The gift has to be unique, because my boyfriend seemingly has everything. Everything he wants, at least. I usually am really good with gifts, but this one has me stumped.
A bit about him: He loves video games, cars, drinking, and anything Irish. Also, he is starting law school next fall. Any ideas?