The LIXIL Corporation My SATIS Genius Toilet application for Android has a hardcoded Bluetooth PIN, which allows physically proximate attackers to trigger physical resource consumption (water or heat) or user discomfort.
https://www.trustwave.com/spiderlabs/advisories/TWSL2013-020.txt
http://www.huffingtonpost.co.uk/2013/08/05/smart-toilet-could-attackmy-satis_n_3706116.html
http://seclists.org/fulldisclosure/2013/Aug/18
http://packetstormsecurity.com/files/122655/LIXIL-Satis-Toilet-Hard-Coded-Bluetooth-PIN.html
http://arstechnica.com/security/2013/08/holy-sht-smart-toilet-hack-attack/