Though incidents are rare, remote control helicopters have caused other deaths. A remote control aircraft instructor was struck and killed in Texas in 2003 and other fatal accidents have occurred in Korea and Brazil. The rotor blades on model helicopters can spin at speedsof 257 miles per hour. Gaui helicopters can cost more than $1,000 and various X7 models are currently selling for around $900, so there probably aren't tons of these just lying around people's houses, but even expensive toys require real safety measures. More here.