What really irritates is people doing this in hospitals, especially the Royal Liverpool Uni when my dad was in there a few years ago. They've two sets of lifts there, one for passenger use, the others marked "Staff Use Only", that are obviously sized for taking a patient on a gurney. However, during visting times the passenger elevators would get really crowded, thus you'd get people I can only describe as deeply selfish, inconsiderate and impatient using the staff only elevators. Incidentally, one of the reasons these were set aside for staff use, in addition to moving gurneys was also for crash teams to move between floors with their equipment quickly, meaning those using them were potentially placing people's lives in danger.