While I think of it

We use this expression to introduce a (small) change of subject related to what was being talked about before.

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Written	No
Spoken	Yes
Formal	No
Informal	Yes

Example 1

See you at the party tonight, then?
Sure. Oh, while I think of it - should we take Marc a present?

Example 2

I saw a really good film at the weekend
Oh, while I think of it, have you still got the DVD I lent you?