People in queues -- for... whatever is being queued for... who when there is a gap between them and the person in front of them in the queue: omit to step forward and close the gap up. Being behind (immediately, or by a factor of one or two preceding queu-ers) persons doing this, makes me feel frustrated and angry. Will admit that this is highly irrational on my part: the thing does me absolutely no harm beyond -- if I am the person directly behind the offender -- delaying my finally being served, by the couple of seconds which it takes the bod at last to go forward for them to be served. Nevertheless, it arouses in me resentment toward the "loiterer" -- feeling (unkindly, I confess) that they are at best oblivious; at worst, in a very small way consciously offensive and malicious; to the people in close proximity to them, and sharing their situation.