Funny/Insane things to spring on your players

[Entsuropi]

C'mon people, lets get a list going.

My opener:
1) The Sentient hand-grenade.
"Throw me! Quickly! There! A group of people! Throw me! Throw! Throw! Through that window, go on, smash it and THROW ME! Your race created me for this one purpose! Damn you! Throw me! It's what I was designed to do! THROW ME NOW FEEBLE HUMAN, LEST I DETONATE ON YOUR HIP!"

[Onion of Death]

2. An NPC dwarf with a curse that makes him yell "ARSE!" after every *cough* sentence. The dwarf's only other words are "Wubble", "Fishbag", and "Slappity". If I remember right he whacked enemies with his beard.

[PaperSword]

3. A D20 Modern Campaign focused on time travel...."AHHHHHHH!!!! It hurts, me brain is imploding." the DM yelled as all past events hurtled back onto his brain, and, without the ability of true comprehension, spontaniously combusts.

Whoops, i guess thats insane, but the players had a good laugh, not anything sprung on them.

[JP Dogberry]

A large pink elephant. Describe it in search a way so that it seems integral to the adventure (regardless of genre or style). The real point of the pink elephant is it's just there, and you should ignore it like and good elephant.

[Mad Dr Jeffe]

A gazebo
an evil gazebo

[Spriggan]

Have the end of your campaign be fighting a lvl 20 goblin.

[JP Dogberry]

Have the end of your campaign be fighting a level 99 stalk of broccoli.  Provide no explanation for the above.

[Mad Dr Jeffe]

replace all treasure with baked goods.

[42]

Give their horse/carriage/dragon/spaceship/mecha/super-vehicle a speeding ticket.

[JP Dogberry]

Give them a lot of money and the oppurtunity to spend it. Then force them to apply encumberance rules in such a way that they need to start loading the stuff onto the horses. Once it's all loaded up, have thunder strike and the horse run away.

[The Holy Saint, Grand High Poobah, Master of Monkeys, Ehlers]

have horse thieves steal their equipment after taking advantage of the fact that they didn't state they were setting a watch

[JP Dogberry]

Say "Are you setting the watch?" and when they give you the details, say "No, really, are you settng the watch, there's a twelve foot tall Digital watch in the forest clearing."

[42]

Get the PCs drunk and when they wake-up tell them that they got married to succubi who are now pregnant and expecting child-support.

[The Holy Saint, Grand High Poobah, Master of Monkeys, Ehlers]

Include this NPC in your cast.

[Mad Dr Jeffe]

polymorph them all into the opposite sex. Rule that the spell is a curse that can only be removed by a wish.

then visit every stereotype on them you can imagine.
And tell your male dwarf player that "her" beard looks quite fetching...