Mine was a pilates mat strap left in my husband's suitcase after he'd been away on 'business' (although the clue didn't actually work at the time because back then I naively thought that my husband - my supposed best friend - actually loved me!).
I assume now that these surprise clues are left in a bid to hasten the demise of the marriage?
I wonder if he raised the issue with her at the time and whether he had a go at her for being so manipulative scatty or whether they had a good laugh at my expense.
I must ask him sometime...