Don't feel obliged to appear hospitable to strangers.
That's the advice from the Crime Victims Helpline - it's warning that recent public awareness campaigns, like the digital switchover, have helped conmen gain entry to vulnerable people's homes.
A number of such cases have been reported across Donegal in recent months.
Victims have had money and goods taken from their homes - but often they don't realise something's missing until long after the visitor's gone.
Maeve Ryan is the co-ordinator of the National Crime Victims Helpline: