It might be easier to just throw some dirty sheets over it and tell her to wash the f**kin' sheets.
better idea tear the wrapping paper up in bits n throw it all over the house....Shell appreciate the new vacume even more LOL
My dad did that for Christmas. Mom was not amused even though it was a gag gift and had an expensive gold necklace in the bag. I swear my mom was possessed by a demon by the way she reacted. Now, imagine if the gender was reversed and your wife bought you a self-propelled lawnmower. Personally, I'd jump for joy! I'd say if your wife has a sense of humor, go for it. Otherwise, don't even think about it.