A few weeks ago, a fellow presented requesting removal of a "male chastity device" which was, um, stuck.

Apparently, the penis is inserted into a restrictive container and secured in place using a retaining ring locked around the base of the scrotum.

It prevents erections, and I gather is a part of submissive roleplay.

It was made of steel and the lock was jammed.

Ultimately, though, it took our largest and strongest bolt cutters and a fair amount of lubricant to remove the offending device.