Full Idea
No sensibile is ever a datum to two people at once.
Clarification
A 'sensibile' is the singular of 'sensibilia', which seem to be potential sense-data
Gist of Idea
No sensibile is ever a datum to two people at once
Source
Bertrand Russell (The Relation of Sense-Data to Physics [1914], §VII)
Book Reference
Russell,Bertrand: 'Mysticism and Logic' [Unwin 1989], p.152
A Reaction
So a loud bang has to broken down into an almost infinite number of sound sensibilia - each one presumably the size of the apperture of a small ear. This is beginning to sound a bit silly.