Okay here's another. Not CFery but theft but thieves are CFers, too, right?
Busy village playgroup a few times a week. Started going when DD was a baby. Eventually the ladies who ran it moved on leaving it in the hands of another mum. Let's call her Betty. After a while Betty started asking me occasionally in the morning to sort the group that day because of whatever reason she had at the time. Okay, fine. I'd buy the snacks, open up and do the sign in book and take the cash and drop it in to her. It got to the point where she was never there and I was running it. No problem, the group was pretty informal and passing it on to the next mum was how the group continued.
One day she popped in and said she needed to pay the hall rent and swiped a handful out of the takings. Except I noticed she didn't actually count it.
Speaking to the old group leaders I found out there was £1000's in the account from a grant and fundraisers they'd had and they were surprised she hadn't bought the new play equipment it was intended for.
Betty kept announcing in the playgroup that she wanted someone to take over but no one was offering except me but she kept saying I'd "done enough. It not fair on me. Make someone else take their turn!" Turns out it was likely because she was aware I knew there was a bank account. She left eventually and handed a bag with about £50 or so in it. No sign in books nor receipts I'd diligently kept and given to her each session. We got the (long gone) second signatory of the account to go and get the statements. Betty has cleared the bank account by forging the 2nd signatory's signature. Police were useless because we couldn't prove that the other signatory hadn't signed the cheques made out to cash despite her saying it was clearly forged. Looking at the statements you could clearly see the timeline of withdrawals matched her Facebook.
"Taking hubby out for dinner!" = £150 cheque made out to cash that day.
"Sandra's Hen do! Woooooo! Newcastle here we come!" = £200 withdrawal.
She got away with it all because she claimed she never kept the receipts or the sign in sheets. There was no proof of income despite there being 20+ attendees each session paying £1.50 each and we couldn't prove she didn't pay £100's a week on the group snacks (a loaf of bread, the occasional margarine tub, milk and maybe a bunch of bananas.)