I understood the first joke and subversion of expectations to be a customer along for a drink (our expectation) and the bartender providing a knife (i.e. suicide, to take the edge off).

The second subversion of expectations was using the knife for a circumcision (edge of a penis).

The third being the offering of foreskin (penis tips) instead of money.

All in all, a rollercoaster from panel to panel. I enjoyed it.