The context of the following conversation is Casey wanted to surprise Jan for their anniversary. Casey got Jan a present.:
Casey says I want to surprise Jan with a present for our anniversary..
The friend responds That's exciting what are you planning on getting her?.
Casey responds Oh it's just a little present to celebrate our anniversary..
The friend responds What is it?.
Casey responds It's a necklace, but you mustn't tell Jan, I want it to be a surprise..
The friend responds I will keep my mouth shut..