A quick search turns up numerous results of the first two. I know I've heard the fineapple joke before. Those are also the only two I would consider a pickup line. Is there a reason you consider these results better?
Some of the article's examples were too off the mark for folks to attempt.
Listen, I know there are stereotypes about the social skills of the average HN poster, and I've got to tell you you're not helping here.
#5 is pretty aggressive, but definitely a pickup line.