To make people laugh you must be 100% into what you're joking about. Nothing is more important than the setup & punch line. Nothing is more important than the attitude and life you give the setup & punch line. And by the way, you never say a punch line you DELIVER it....100%
Audiences can sense when you're hedging. Stand up comedy can never be 'hedged' it takes commitment...100%.
Give each moment 100% and the next moment will already be well on it's way to 100%.