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After the Lecture

Okay, this was just a random idea I had. Was actually thinking it might work better if they were in the middle of a lecture, but that can easily be rewritten. Also, the last time I did chemistry was two years ago, so feel free to correct any mistakes I make. Also again, the Cleaner entirely wearing purple is a chemistry injoke, in that anyone who has had lectures in the Chemistry building will know that guy/girl, but it doesn't detract from the sketch at all; it's just there to be appreciated if people get it.
A LECTURER is wearing a labcoat and standing next to a table of chemical equipment. There is a blackboard behind him covered with chemical gibberish.
L: ... so if you take a double-bonded chemical such as ethene and add a hydrogen halide such as hydrochloric acid, the double bond will break and you end up with dichloroethane. Alright, that's the end of the lecture, I'll see you thursday!
The CLEANER (who is wearing entirely purple, including purple crocs, and a purple beanie) ambles in and starts to clean the blackboard.
C: How'd it go, professor?
L: Not too bad, thanks. Been focussing on Organic Chemistry for the last couple of weeks.
C: Oh! Sounds a bit beyond me.
L: Well, it's easier if you've studied t as long as I have! They're not exactly the most responsive lot. It's like it doesn't make any sense to them.
C: Are you sure this is right, Professor?
L: What?
C: This reaction diagram here. (Pointing to the blackboard) I was just noticing that the Curly arrow should be pointing here, not here. (redraws it)
L: Err... oh, yes! So it should! Must've just slipped my mind for a second. Keep cleaning the board, will you? I've got another lecture in ten minutes!
C: Righto. Hang on. What about this formula here? (Points) Shouldn't there be three hydrogen molecules and one chloride attached to the carbon? Why is there two?
L: How do you know that?
C: Well, if you clean blackboards for twenty years you're bound to pick up on some Organic Molecular Chemistry!
L: Well, not really, because you see... well, yes, okay, but it is more complicated than that!
C: Well, what about this! This isn't more complicated! According to your logic here, 1 plus 1 is equal to 3.1415! I fail to see the logic in that, professor!
L: Just clean the fucking blackboard!
C: But this is completely wrong!
L: I think someone with a PhD in... whatever this is... would know more about it than just a little cleaner, thankyou very much.
C: At least I can count.
L: No, you can't. Look, here come a couple of students to ask ME some questions!  
A first year student enters timidly.
S: Um... excuse me, sir?
L: Yes? What's the problem?
S: Well, I'm just not completely sure about this whole Organic reaction chemistry thing. You said that the molecule was dichloroethane. Shouldn't there be only one chloride atom?
L: Well, my dear, let me explain. It's a lot more complicated than that-
C: Yes, that's absolutely right.
L: Shut up! As I was saying, this kind of reaction-
C: Is incredibly simple!
L: Drop dead! As I was saying, this is the kind of reaction that you'll only look at in third year, and so-
C: This guy has no idea what he's talking about!
L: Go clean the toilets! As I was saying, you'll just have to take my word for it-
S: But it doesn't make any sense!
C: No, you see, what you need to do is put the curly arrow here instead (shows her). See?
S: Oh! Right.
C: And then you have to redo this calculation here, and you'll get a different number!
S: That makes perfect sense! I see!
L: No you don't!
S: Yes, I do! (To C) So what about this one here? How does this reaction work?
C: Well, I'll show you. (To L, hands him a cloth) Clean the blackboards, will you?