Agree with many of those above; “victim” is mild. Please, please, PLEASE, ask your friend’s DH if he knows for sure your friend would be OK with a surprise party. A very close friend of mine threw me a surprise party and within less than one second of “SURPRISE!” I was out in the door, in my car, and left DH to suffer through the party stag. I drove back home, took a shower, and went to straight to bed and no one ever mentioned the fiasco again. Not everyone considers a surprise to be a good thing.