Where is the letter opener?

So I'm winding up a call to my gran last night:

Grammy: Ask Shan to tell you about Grampa and the letter opener.
Me: Ok will do.

...

Me: Hey kiddo. Grammy told me to ask you about the letter opener.
Shan: *giggle*
Me: ...*waits for giggle fit to pass*
Shan: So, you know how the G's letter opener has been missing for quite a while now?
Me: No, but let's assume I do.
Shan: Ok, well you know how the letter opener resembles a butter knife?
Me: ... *falls off the chair laughing*