The 22-year-old entrepreneur said that he felt "mixed emotions" about exiting the compound tonight due to all the fun he had with his housemates over the last seven weeks.
Recalling the moment he scrapped the house shopping list for 500 bananas, Harry said: "I've not really watched much of Big Brother before and the trouble was the housemates became really unhealthy, so I thought what we need is bananas."
Asked by host Brian Dowling if he regretted the prank after Jay Mckray's outraged reaction, he replied: "Not one bit. I loved every second of it. [Jay] kicked up so much fuss, he said 'I'm going to die'.
"He even made a point of forcing bananas down him in order to give himself potassium poisoning."
Harry went on to liken Jay to "the horse with three legs" when it came to surviving evictions and confessed that he had expected the Geordie fitness instructor to leave tonight.
"Everytime he's been up for eviction he's only just escaped," Harry argued. "l love the guy to bits, I just thought this week he'd be evicted...I'm glad he's safe because he was so confident in his [prediction of leaving]."
The wannabe millionaire also confessed that he was surprised by the argumentative nature he adopted in the house, insisting: "I'm never confrontational but because in there i knew nobody was going to punch me in the face I just stepped up."
Harry then addressed the subject of Jem Palmer's voluntary exit, which resulted in him being put up for eviction mid-week.
"Everyone is going to treat the experience differently," he accepted. "We've all wanted to walk at some point while we've been in there.
"She knew that if she walked the rest of us would be up, but you can't let that ruin your experience. If you've got to leave because of one reason or another, that's your choice."
In his goodbye message, Harry identified Alex Rose as his favourite housemate, adding: "You always have been, you always will be."
He also told Aaron Allard-Morgan - who he earlier described as Big Brother's "golden boy" - that he was his "best friend", while he called Faye Palmer "a real sweetheart".
Harry finally asked Tom O'Connell to be his "new gay best friend", called Jay "an absolute cracker" and assured Louise Cliffe: "Whatever people think I've said about you, it's not true. I think you're an absolute star and you will go far."