That is actually very common for people who meditate regularly.Reminds me of a friend from work who always tried to meditate while riding BART from San Francisco to Orinda. She was quite adept at somehow cancelling out all the external noise of riding in a high-speed subway car.
A while back, friends dragged me to a football tailgate party. The crowd, the chaotic environment, the mixed blaring of different music, the smells - all way, way to much for me.
So I (intentionally) slipped into a meditative state and just ignored it all.