When in France, go to the Hotel de Ville (this is a chain that has a house in almost any French village ;-)) and insist you have a booking for a double room there ...


With a handful of friends:
Pick a phone number from the directory.
First friend calls - if there is an answer, he asks for the son named "Christian" (pick some name ...) and leave a message for that son, even if the called person insists they don't have a son named Christian.
A few minutes later, second friend calls the same number, also asking for Christian and leaving a message for him.
Some more minutes later the next one calls the same number - go on till only the last friend has not called.
At this point the called person will get quite angry when asked whether Christian is at home.
Now the last of the friend goes in for the kill:
When he calls the number and is answered, he says:
Hi Mom *), Christian here - has any of my friends left a messages for me?

*) or Dad, depending on the sex of the called person.