One thing that any length of time in HR will give you, is a healthy dose of cynicism and a nose for the suspicious and we can't resist looking into things that just don't add up.
I remember when the swineflu epidemic was in full swing employees and employers were all overly cautious about transferring and catching bugs. People calling in sick left, right and centre claiming "SwineFlu". Interestingly, a colleague of mine sent two of his employees to have independent tests when they claimed they had the dreaded virus... neither tested positive and the company didn't have any further claims from employees, who diligently continued to turn up for work. Hmm....
However, it is expense claims that bring out the Sherlock Holmes in us HR people, and continue to amaze us at the cheek of some employees. Vague receipts from foreign trips often turn out to be lunch, dinner or tea, but have also turned out on investigation to be clothes, adult movies, massages or even tennis lessons .... Thank heavens for the internet, a sense of humour and for employees who claim that a bill for headwear is in fact lunch! .. well, I'll eat my hat!