This ever happen to y'all?

[Gos]

I've done that too, just stopping mid sentence because they're not very interested.. it makes things awkward, though. Haha.

LOL I know what you mean, the person then looks like s/he is miles away with their mind... and just randomly responds with "Yeah, Yes, Aham.."...

But that also happens to me sometimes! ;)

I either stop mid sentence and look at them or just say random words. The latter is better for comic relief after the realization, to help avoid the awkward moment.