I had not previously come across this component of the expression, but became familiar with 'deictic expressions' in linguistic studies. It's the sort of context-sensitive mannerism we'd all recognise which becomes well-nigh meaningless if the speech act is recorded - for example, someone says "I'm going to drink that". Superficially this seems close in structure to sentences like "I'm going to drink milk", but it depends for a crucial aspect of meaning on a physical action (pointing, nodding etc) which indicates the referent of "that".