GIANTS head coach Jon Sharp is counting on his players to have learned from two tough history lessons when they face Doncaster Dragons at the McAlpine Stadium on Sunday (3.00).
Sharp's unbeaten Super League side start the weekend clash against their National League I opponents as red-hot favourites to progress to the quarter-finals.
But the Giants have, of course, been on the receiving end of two major Challenge Cup shocks in the last two years, and Sharp is determined there's no repeat and the completion of a highly unenviable hat trick.
"I wasn't here when the side lost at Doncaster and then lost to Hunslet last year," said Sharp.
"But there are a lot of players who were, and I know they are still smarting from the nightmarish experience.
"Being on the receiving end of a Cup shock is very painful and I'm sure the boys won't want to experience that feeling again this weekend.
"The defeats taught them some very harsh lessons and I expect those lessons to have been learned this weekend.
"There were warning signs in the last round against Pia that we can't afford to let complacency creep into our game.
"I will be disappointed if it happens again."
Of the two Cup exits, the horror show at Hunslet on February 8 last year was the most disturbing.
Despite two tries from Brandon Costin and an effort from Marcus St Hilaire, the newly-promoted Giants suffered a deserved 18-14 defeat.
Costin's ankle injury means he is a major doubt this weekend, but St Hilaire is expected to be one of nine players in action this weekend who played against the Hawks 12 months ago.
The others are Ben Cooper, Hefin O'Hare, Julian Bailey, Mick Slicker, Paul March, Darren Fleary, Eorl Crabtree and Darren Turner (if he recovers from the back strain which kept him out of last week's Widnes win).
And in the 30-10 defeat at Doncaster on February 10 the year before, the side included Paul Reilly and Stanley Gene as well as O'Hare, Crabtree, Cooper, Slicker, March and Turner.