Having had a major run-in with LY security in LHR back in December '12, I drew up a list of all of the questions asked to me (for the purposes of the complaint I then filed). From memory, there were around 47 questions, and I'm sure the agent would have tried to think up some more...

Besides, the 'stock' questions are ones that everyone knows (and has their answers prepared for). Discussing them in general won't be any issue security-wise IMO, as the agents are (supposed) to be trained in items like body-language as well