One of the random things I like to do for a guy is slip a little note in his pocket with something sweet or sexy written on it. (or hey, even just a coupon for one free blowjob - but then again if a guy needs to redeem a couple for a free blowjob then he probably isn't dating me... sorry TMI... back to the topic at hand...) Make sure to hide it somewhere that he won't find it until your not around, this way he'll get a stupid grin on his face at work or around his buddies, and then they can pick on him (or try to steal the free bj coupon from him) *evil laughter*
On a more specific note, I have this one guy who is much older then me and I love bugging him about it... He told me once about how he LOVED this "green slime" as he put it, that he had found at the grocery store and really only bought because of the colour. I figured out that he was talking about Aloe Vera Juice... The show I was working on at the time was just wrapping up and someone had left this bottle of super juice that's suppose to be good for your health blah blah blah, but it was called "Youth Juice". So to continue on the joke I took the bottle, drank the weird tasting "youth juice" and filled it with his favourite "green slime". He freaking loved it! -All this to say, personalize, make it about your inside jokes or the stories he tells you.
-Putting the Naughty in Nautical.