I agree with some that say heckling can add to an act. Try South Shields folk club, the rapore is cutting, witty and hilarious, no one is immune, even people on crutches ("gethim a set of roller blades") let alone the guest! This is good humoured and makes the club one of the friendliest and ameniable places I have ever guested in. I can't get on with people who deliberately set outwreck an evening, probably jealous because they are not the centre of attention.