"Bottoms up" joke

This happened during the British Raj.
The then sub-collector of Penugonda (now in Andhra Pradesh) and his Memsahib were always quarrelling. One night, the' Buna sahib' became very angry with his wife and shouted,' You bloody bitch! I will slice you into two.'
At that precise moment a drunken gentleman who was passing by the bungalow shouted,' Please let me have the bottom half.'