Harry three times Imperius was used on him?

[christine m breen]

No: HPFGUIDX 31241

I just finished reading GOF for the 4th time last night.  I just noticed
that when Voldemort uses the Imperius curse on him in the graveyard, the
text says it was the third time that curse had been used on Harry.  Once
was when Moody did it to him in class, second time was Voldemort, but
when was the third time?  Very interesting.
Christine