Ok stay with me for this.
I stuck £50 cash in an envelopes.
I gave one to A and one too B. Said here is your Xmas presents early.
A and B swap envelopes.
A and B then hand me back the envelopes...
I then thanked then for my Xmas gifts and asked if they were happy as that was Xmas done....
The way I see it we all got £100 in Xmas cash....LOL.