what do Harry Potter and Edmund Blackadder have in common?

I was thinking about that interview JKR gave recently where she said she took Daniel Radcliffe to dinner and he apparently said to her "I've got to ask, do I die?" This struck me as very funny in a 'Love, what's my motivation?' kind of way but then her answer ( possible spoiler for DH )

had obviously been swirling in my brain and yesterday it just came to me that what happens to Harry in DH reminded me hugely of the final episode of Blackadder the third. I think this is one of the funniest things ever written - I particularly love Stephen Fry as the Duke of Wellington. I could quote favourite lines till the cows come home. But at the end where Edmund has to fight a duel with the Iron Duke (congratulations on purchasing the Armstrong Whitworth 10pounder cannonette)( possible spoilers for DH if you squint a bit )

It just struck me that this is kind of a crack version of that bit of DH. Maybe it's just me.