Some people keep very strange mementos.....
I'm a Paediatric nurse and many moons ago I had been looking after a baby who had been having NG feeds and when I removed the feeding tube prior to discharging the baby the dad asked if he could keep it 
I thought he was joking actually seeing as when I pulled it out it was lined with stomach juices and looking particularly disgusting but he was being serious and said he wanted it for the child's memory box!
I popped it into an envelope for him and told him it was the strangest request I'd ever had!! 
Looking back I should have refused with legitimate reasons around germs etc but at the time I was just so shocked!!