The only time 2 people leaped into the imaging chamber. During his leap out of "Return of the Evil Leaper - October 8, 1956 (#5.16)", Sam purposely dragged Alia, the evil leaper he met in "Deliver Us from Evil - March 19, 1966 (#5.7)" and when he reconnected with her in order to save her from evil. See more
You know, Thames, this is the perfect place for revenge.
Other than a 12th Century torture chamber with iron maidens and a few racks, it runs a close second. But you know, I wouldn't put it past you to call Torture Chambers-R-Us and ask for an immediate installation.