Wasting time wasters time
PicMas,
I do something similar if I get cold callers on the phone, asking if I want a new mobile phone, insurance, won a trip to Disneyland etc.
I try to see how long I can keep them on the phone or see how outrageous a discount I could get by lying about other offers etc.
My favourite is to tell them the door bell has just gone and to hold on, put them on speaker and go make a cup of coffee, then every now and them tell them you will be there in a bit standby..
About 30mins is the best I have done.
Bayete