What mischief can I think of next?

A couple of cheeky keas outside the Wobbly Kea cafe in Arthurs Pass were entertaining tourists in the street.  An open car window was seen by this bird as an invitation to entry, fortunately hastily withdrawn by the car's occupants.  In spite of the frequent notices requesting visitors not to feed the birds, they regularly outsmart the tourists and obtain food from them anyway.  This provides the birds with plenty of spare time to exercise their brains and beaks to find new forms of entertainment, usually to the detriment of human property.  Car mirrors and windscreen wipers are favoured toys.