Lots of people (myself included) made a big deal about Centro closing in 1:48 over the final 800m at USAs.
Others suggested that El G and others had far more impressive final 600-800m closes in 1500m races.
But the semis at Beijing were especially full of crazy closing splits
Heat 1 (Where most guys eased up at the line)
Leader at 800m - 2:08.82
Time over final 700m - 1:34.68 (1:48.2 pace)
Heat 2
Leader at 800m - 1:59.04
Time over final 700m - 1:35.96 (1:49.67 pace)
Hard to tell how far back exactly the heat 2 guys were from the leader, but it seems like every runner that qualified for the final had to run basically a 1:48-1:50 final 800m just to get in.