Glitch: Carry items while climbing... Something
Get under a vine thingy or metal fence thingy or anything that you can climb up.
Pick up something that can be picked up, like a P switch or a shell. Get under the climbable thing, throw the item up, jump, and hang on to vine/fence.
You SHOULD see this: you hanging on to the fence/vine, and the shell/key/P switch above your head, falling down. Now all you have to do, is hold UP and B
(UP and Y if you're playing on SNES) and TADAAM! You're climbing AND holding something AT THE SAME TIME!
Added by: Mario Bros Revived Jan 7th 2008, ID#11656