Messing with your kids

Have you ever done anything just to screw with your kids' heads? Think Calvin's dad from Calvin and Hobbes.
http://sleepyhead5591.xanga.com/637204910/calvin-and-hobbes---calvins-dad/

I wanna hear stories if you've done something like that!

I'm bored. Indulge me :p

Link doesn't work.

I know I do, but I can't think of any specifics.

When my sister and I were younger, like no older than 8 and 5, we went to a Mexican restaurant and my dad convinced us the long carrot shaving was a cow tongue. We cried when he ate it  

oh man. My dad convinced me that because of all the site we'd be getting the winter that the school decided school weeks would now be monday, tues, wed, thur, fri, & Saturday and school would be until four pm.  

On a daily basis!  

Aside from the usual, jumping out and scaring them, I like to tell them random things. Last Friday, we told the girls that the school called and they had a make up day on Saturday. The oldest is like yeah right...but the youngest? Girlfriend was up and dressed at 7.  

I tell my 5 year old silly things but he never relaly believes me. He's lived with us for too long, he knows we are always full of smurf. The girls are just getting used to it.