Ok here's a list of things Jonah has done or does do:

Drew on the wall with pencil.
Tipped the cat water all over the floor.
Put his hand in the wet cat food and squished it between his fingers.
Broke a brand new jar of dijon mustard trying to take it off the bench to hold, it smashed on the floor instead.
Loves to close doors and locked me outside one day and held melbel and Sammi's Caleb hostage in Mel's bathroom.
Takes nappies out of the nappy stacker and throws them all over the floor.
Presses buttons on the remotes/t.v/video/dvd player/security alarm remote/phones etc.
Pulls DVDs and books off the shelves.
Gets into the wipes and pulls them to bits.

I'm sure I could name more but I think that gives you a fair idea of all the mischief he gets into, lol.