Did they just do that?

There are some things that you just do not do when you are out to dinner.  The other day I had a table of three that seemed like a good crowd of people.  They ordered dinner and when they were done I cleared their plates.  The table next to them just got up and they did not finish their desert.  Before I could go over and clean the table I noticed my other table reach over and take the desert right of the table who just left!  You do not do that, that is a gross thing to do.