This post deserves an award. Well done, Mr. Alistair Cookie.Serious
You're repairing something, and you finish turning the final screw.
"ça y est!"
A friend is having trouble putting his contact back in cause it's windy on the beach. You're watching and he seems to have succeeded.
"Ça y est?"
"Oui, mais ce vent est vraiment chiant."
You're trying to recount a movie you saw to someone but can't remember the name.
"Celui où Bruce Willis sauve le monde."
"Mais c'est tous les films Américain."
"Celui dans lequel on soit faire exploser un astéroĩde."
"Oui, c'est ça!"
Your girlfriend has been picking fights with you lately, she makes a smart comment about something and you can see she's starting something again.
"ça y est. ça commence!"
You're having a go at someone...
"Je suis allé en Ecosse l'année dernière et j'ai vu le monstre du Lochness."
"Oui, c'est ça."