This is a highlight reel of the most cringe-worthy scenes in comic book movies, as compiled by io9. They also have a user-submitted list of the whole top 50 on their website. Which do you think is the worst? I've actually only seen four of the movies included in the list so I'm not a very good judge, but I definitely feel like the duck boobs from Howard The Duck should not have have been part of the list. There was nothing cringe-worthy about that. That's probably the best part of the movie, and definitely the only part I have saved as a gif on my desktop and watch whenever I'm sad or lonely.
Keep going for the worst of the worst.
Thanks to Andrea, who agrees the most cringe-worthy part of any comic book movie is any scene without Chris Pratt in it. Especially all of the new Fantastic 4.