Humor in doses is almost always a good thing. It's often said that if you can make a girl laugh, you're halfway in her pants. Granted, I'm not that shallow that I only care about getting in her pants, but you get the drift.
Humor is important, and especially so when two strangers meet.
Humor can help build rapport faster than deep conversation or a string of questions and answers could ever hope. I understand where you're coming from by thinking it could seem absurd, but the very most important thing about this stuff is having
INNER GAME. You can't really worry about the outcome of such chance encounters. You can't think that she might think it's absurd; it will show in your demeanor when you say it to her, she will see that you are basically qualifying to her, and thus a lack of self-confidence, and then she really WILL think what you said is absurd. By then, the battle will be lost, and it will have become a self-fulfilling prophecy.
For example, I'm a cashier at Blockbuster. A HB walks in, and picks up a Pepsi to bring to the counter. On plenty of occasions, I've playfully said, "No diet? Damn.. there goes that figure.. lol" (gotta say it right fellas..
inner game), and she'll laugh out loud too, and go "I know, right?" ...and that'll be a conversation. But if I thought before I said it that she would think I was crazy, she most likely would, and would clown me right then and there. So you gotta stop thinking about outcomes, and just be the cool, funny guy that you know you are.
The best advice I can give you is to work solely on you
inner game before you randomly try to approach any more girls. Its the most important aspect. I'm at the point right now where I'm confident enough to walk up to a random HB, and say the first thing on my mind, see how she reacts, and continue with a conversation, regardless of the outcome.
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"School Game" 
Linear Mode
