Every office needs a Phone Pig

Is there anything worse than an unanswered phone – particularly an unanswered mobile phone, with the choice of (invariably annoying) ringtones, hidden in someone's jacket pocket or holdall? My mate's office has come up with an ingenious solution.
If you leave your phone unattended, on or by your desk, and it rings – the Phone Pig, a classic piggy bank, is placed on your desk. You are forcibly invited to contribute a pound to the kitty (er, I mean 'pig') which will then be spent on an end of year party / drink / dinner for the entire team.
Thankfully, as someone working mainly from home, this isn't such an issue for me. But I have worked with some serial offenders in the past, and this would have been a fantastic response. 🙂