Really the pilot would have soon found out. A couple of hundred yards aborted takeoff and red face
The worst scenario is in the air with a blocked or frozen pitot which is far more serious.
One tip in that situation is to look at the GPS groundspeed. Low level where IAS and TAS are not far off and where the pilot is wind aware it is a fairly accurate substitute.
Also useful for a runway approach where there is no ground radio to confirm the runway you are using is into wind. Check the GPS ground speed against the ASI speed if slower you have a headwind if faster a tail.
Not an exact science with either but a lot better than nothing and in part one could save your life.
Pace