This was a little experiment. It's a bit twee and perhaps been done before.
Int. Supermarket
Sarah is looking at the cereals. Lucy approaches her.
Lucy: Sarah Macintosh?
Sarah: Lucy Baker?!
Lucy: I haven't seen you since school!
Sarah: I know! It's been so long!
Lucy: How are you getting on?
Sarah holds out her hand to show a ring.
Sarah: Engaged!
Lucy: You lucky cow!
Sarah: How 'bout you?
Lucy: Still single!
Sarah: You'll find the right man soon!
Lucy: I hope so! Here, d'you know who I just saw?!
Sarah: Who?
Lucy: Tim Tim Not So Slim!
Sarah: Tim Tim Not So Slim?
Lucy: Yeah! That chubby guy you used to sit next to in Maths, remember?
Sarah: Lucy, I don't think-
Lucy: You must remember him! The boys used to call him Tim Tim Don't Like Quim!
Sarah: Lucy, I-
Lucy: God, he was such a loser! He still is by the looks of it! No dress sense!
Sarah: Well I better be going now, so-
Lucy: Come back here you! I wanna hear more about this man of yours!
Sarah: Well... his names Tim.
Lucy: (LAUGHS) What a coincidence.
Sarah: Uh...
Lucy: Oh God! Here he comes! Tim Tim Get To The Gym! (LAUGHS)
Tim walks into shot, he is an overweight man. He puts his arm round Sarah and kisses her cheek. Lucy looks embarrased.
Tim: Hello Darling
Lucy: So, uh, when's the wedding?
Sarah: July.
Lucy: Can I... come?
Sarah: No.
ENDS
And I think the ending is a bit obvious.