Yes - I have seen it many times on power change-over before start, but never in the sim or the a/c airborne. I have always assumed it was some sort of 'black magic' in the ADC. It is accompanied by what appears to be a 'self-test' on the ASI (and sometimes altimeter) including VMO/MMO flags etc. It certainly would not help with an engine failure.
Asfkap - there would have been many 'snagged' a/c and many delays.......