I haven't had a delivery issue (also knocking on wood), but something similar. I made a co-worker's wedding cake (my gift to her), delivered and set it up at the venue and left to go home and get ready to go to the wedding. About 15 minutes after returning home, the venue called to say the cake was on the floor!! I jumped back into the car and drove back to the venue, and there it was, but not as bad as I was expecting. The top tier had fallen off, but landed on the table. I fixed it as best I could and put the bad spot on the back. I was HOT! Not sure how this could have happened because the table and the cake were stable when I left. I talked to the women who called me, and as it turned out, the guys that delivered the keg bumped the table the cake was on.