At caribou:
Many people never bother to change the default password on their Telecom answer phone service (it's the last four digits of the phone number): this simple fact has provided me with hours of wholesome fun. I once broke into the Presbyterian Support Services answer phone and re-recorded their message word-for-word, but with an oddly camp Polish accent. At the end of the message I sung a little song of my own devising. I spent a happy afternoon listening to the messages left by bemused parishioners; the vicar had re-recorded the message by the end of the day.