SyriaTube recently uploaded a video that claims to be a Syrian rebel, supposedly NATO-trained, loading and misfiring a rocket-propelled grenade launcher with disastrous results.
The video (below) has not been verified, but it's worth noting that SyriaTube supports (and may be controlled by) the Assad government.
The man who misfires is fighting against the government with the Free Syrian Army.
There is no notation as far the location or time of the accident, although there are Persian subtitles on the video that may contain that information.
WARNING: GRAPHIC VIDEO