From the BBC:

Small cars driving through a safari park in Merseyside have been chased by confused lions who think they are prey.
Staff at Knowsley Safari Park are monitoring smaller vehicles, including Smart cars and Mini Coopers, after the lions started paying special interest.

David Ross, park manager, told the BBC News website that a group of lionesses chased after one Smart car after being confused by its compact appearance.

He said staff were stationed near the enclosure to keep visitors safe.

[ Confused lions ‘hunt’ small cars ] BBC

Thanks Charles