kerfufflesnufalufagus
A singular sneeze of such shock and/or magnitude that you completely and instantly forgot your situation, your location, and all thoughts and/or conversations that took place before the sneeze.
While I was in the middle of a job interview, I experienced one of the worst kerfufflesnufalufagus moments that I have ever had, making me to forget all the material I had prepared before the interview, which, in turn, caused made me not get the job.