Sweet Thunder has a collection of home recording tapes found in charity shops, which are fascinating for the glimpses they give into private and work lives, some of them decades ago. There are stalacpipe organ recordings and astrology readings, but strangely the most interesting are the more mundane moments: a legal secretary practising her pronunciation of legal terms ("Pun-i-tive damages. Quaa-ash"), some drunk men talking about spreadsheets, and a surgical needle sales meeting.

Best of all is the conversation between an elderly couple, where he ruefully admits to falling for her April Fools Day joke yet again:
"In 51 years I've never missed an April Fool. I can get you ten times in a day!"
"The thing is I think you're so sincere about everything. Trick after trick after trick!"
"April Fools Day I lie all day long."