This ever happen to y'all?

[Gaijin]

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.

Yeah that's so funny, you start just talking some random crap and when you notice they listen to you again, you ask them if they understand what you're saying....
Most of times they say yes and when you tell them what you were talking about, it's like don't remember!