Duck tape his doors shut. Put all around the body lines of the doors. use a LOT!!!!!! I did it to a buddy once, on his two door truck I used a whole roll of tape. It took him an hour to get one door open just to get in.
OR
Wait till you know he is not home call his wife/gf say did "bob" make it home all right? Last I seen him I was trying to get him out of the bar, he was pounding down drinks with some chick Just wanted to see if he was ok . he will catch a sh!t storm for somthing he has no clue about. the key is to call her back the next day to tell her it was a joke, you don't want to wreak a marriage. I did that to the same bubby with the duck taped truck. and yet he still talks to me.