Eventually just laugh and hope it wasn't a question

And when it is a question you just stand there looking like that seal.

After the 5th time whip out a piece of paper and make them write i down.

I had this happen to me with my crush. I was unable to know if he asked HOW I was doing or WHAT I was doing,eventually my brain just went into retard mode,which caused me to stammer like a crazy person.