As I have written before here, there was a significant change in the odds in the Santa Anita Derby after the gate opened. Giacomo dropped from either 5-1 or 6-1 all the way down to 7-2 and the odds on Sweet Catomine went up from 4-5 up to 1-1. With the size of that pool, that would have had to have been a pretty hefty late wager.
I was aggravated, but, after 90 seconds, the aggravation lessened quite a bit.
I must say, my moniker aside, this sort of thing makes me very wary of betting places where things like that can happen.