Glyph of Warding (Lightning).
Explosive Runes on the Seat (Thanks OotS).
Beware!  Kobolds live down there!
Owner not responsible for any genitilia Severed and eaten by Otyughs.
Crude Drawing of:
l (Halfling Penis)
l (Human
l   Penis)
l (Dwarf
l   Penis)
l
l (Orc
l   Penis)
l
l
l
l
l (Storm
l   Giant
l   Penis)
l
l
l
. (Elf Penis)
Bedit Doubles as Decantur of Endless Water.  The Command Word for the Salt Water Geysor is at Eye level when unit is being 'Used'
"Klaatu Varata Nicto!"
"As a Lich, soft tissue would the first to shrivel and be destroyed; Thus Vecna has no Penis!"
"LEROY JENKINS!"
"Who the (Bleep) rolled at Nat 1 in Here!  Urinating is a SKILL CHECK for CRYING OUT LOUD.  Take 10 if you can't hit the target!"
(Crude drawing of Halfling Maiden 'serving' several Ogres; indicating just why they get a Bonus to Dex based Checks).
And my Favorite:
Crossbow Trap with +1 Bolt of Wounding hidden down the Toilet Hole.  Not only Flat-Footed, but Dropped Pants!