In a German version of Lupin III - Dragon of Doom, Fujiko is taking a shower when an intruder snekas in and knocks her out. He takes her back to his bout while his partner makes the appartment explode. She wakes up bound to a chair in a research lab. Lupin and his gang come to rescue her and think they have, only to find out it's an impostress. Then she is revealed while still bound to the chair. The entire room is then gassed with laughing/maniac gas and they try to kill each other until an explosion provides a way out.
The second link is to watch online, the third is download.