Havoc likes pens, but only if he can't find a zip-tie. He doesn't take them in the tub though. He usually bats them around til he loses them under some furniture, then whines until I dig it out. I guess they like the way that the pens spin around or something.

Toby likes jumping in and out of the tub and between the shower curtain liner and the curtain. He doesn't take toys in there though.