Police hear about a jewel robbery by an elephant – so they interview the old man who claims to have witnessed it.
'You saw it?' asks the policeman.
'Yes,' says the old man.
'Tell us everything,' says the policeman.
'Well, this elephant came up to the jewellery shop, smashed the window, sucked all the jewellery up in his trunk and then ran away.'
'Was it an African or an Indian elephant?' asked the policeman.
'How should I know the difference?' says the old man.
'Well, African elephants have bigger ears than Indian elephants,' says the policeman.
'How on earth would I know?' says the old man. 'He was wearing a stocking over his head, of course.'