They're never as close as they look.. ATCOs at Heathrow Tower, when I was there about 100 years ago, were a quiet, unassuming bunch.. never given to any form of exaggeration.. So, when one popped his head through the rest room doors and announced "The next two landers are so tight they've got the same stand number", the assembled multitude moved in an orderly fashion, similar to a football crowd, to the nearest window. The sight of one turning off with the next one touching down was usually greeted with "..could have got one away in that gap", or "Checker doing an inspection then?", or "s'pose they were making room for a towing Jumbo".... and all the usual rhubarb....
Meanwhile, the Air controller, just relieved, was hurtling horizontally through the Approach Room doors bent on shaking the the Final Director warmly by the throat for making his hair go instantly grey...
Oh happy days........