In this scenario it's an international trip with 2 F/O's that is going to have a TOE on it. The senior perp will see that and try to swap his (non-TOE) trip with the JUNIOR of the two, if he is senior to the other F/O, the one who would be let off the trip, so now HE gets to stay home, the junior F/O flies the better trip and the guy who thought he was going to stay home....has to go do trash bags and water bottles on a TOE.

When I was a mid seniority MD11 F/O, this would happen all the time if I was lucky enough to get a TOE trip and be the 'senior' of the two F/O's. The way I put a stop to it was, I called the number one F/O, and swapped with him, after I saw that the douche F/O had swapped with the more junior F/O and I was going to have to go, vs. stay home. My buddy, number 1 F/O, got to stay home and I flew his trip, the best trip in the base. Douche had to get the trash bags and water bottles.