A boatman is dropping a software engineer across a river.

software engineer: hey man ... do you know c++ ?
boatman: don't know sir
software engineer: do you know oracle?
boatman: don't know sir
softaware engineer: you unenducated villagers are fit for nothing
boatman: sir, do you know swimming?
software engineer: don't know ... why do you ask?
boatman: the boat got a leakage ... its going to sink ... i am jumping off