So I was getting into my car, and this bloke says to me ’Can you give me a lift?’ I said ’Sure, you look great, the world’s your oyster, go for it.’

The joke hinges on the ambiguity of “give me a lift.” In everyday British English it commonly means “give me a ride,” but it can also mean “raise my spirits” or “give me a boost.” Cooper’s comic persona often exploited this kind of literal-minded misreading: he responds as if the stranger is asking for encouragement rather than transport, offering upbeat motivational platitudes. The humor comes from the mismatch between the practical situation (someone needing a ride) and the inflated, self-help style response, as well as the sudden shift from street-level realism (“this bloke”) to grand optimism (“the world’s your oyster”).