Heh, when I went through the TOMB as a 13 year old, one character went through the idol, and disappeared. The others, thinking it must be a portal, willingly jumped in after. Game over.
the second time we tried, the dm giving us the chance to play the exact same characters in an "alternate universe." We made it all the way to Acererak (with a fallen paladin, an elven female exploring her new body, and a naked dwarf (shudder)). We all died horribly, or rather had our souls sucked. Hmmm. Perhaps it's time to send a party in to rescue those brave heroes, I still have those 25 year old goldenrod character sheets around here somewhere....