Not that Hitler is pleased with much these days—given the fact that he's been dead for almost 70 years—but he's positively, profanely irate at the soldier who falls prey to Loki's pointy stick in Joss Whedon's Avengers. (Spoilers ahead!)
This is the meme that just keeps on giving. Sure, Hitler has been pissed off by lots of other pop-cultural events: the deaths on The Walking Dead, Disney buying Marvel, the cancellation of Wolverine and the X-Men, Ryan Reynolds starring in Green Lantern ... but he seems especially ticked off at Agent Coulson's death in The Avengers:
Personally, I think we should focus on cracking the temporal technology that allows Hitler to learn about events decades in his future.