People who know me, know enough to not even try to get me a watch, light, any camera equipment, etc., unless I explicitly specify right down to the catno/SKU/whatever.
“Hey, I got ya a light! You’re crazy about lights, right? Lookit this… it’s tactical! …and it zooms!” 
They’re proud of getting me something so thoughtful and useful, and I’m thinking to myself, “Hmm, whom do I hate so badly that I can dump this onto?”.
Even when I make out a very specific Christmas list, b’day list, etc., I typically don’t get what’s on it anyway. So, I buy my own stuff.