You can tip a potion of levitation onto the ground, which in addition to its normal vapor effects, causes any objects buried there to float to the surface.

Not specified on if this would have an effect when over a liquid; perhaps the items would temporarily float to the surface and immediately sink back down.

You should be able to #tip potions onto your own square or onto an adjacent square. When tipped, it causes vapor effects to all monsters in the 3x3 area around that square, including yourself, and also causes “potion on skin” effects to the monster it was tipped onto. Some potions may not have such an effect beyond their vapors, but ones like polymorph, acid, and healing ought to.

Among other things, this provides a way to administer polymorph or healing potions to a pet without attacking it with a wielded potion.

Add a message for #tipping your fedora.

Grab bag: a magical bag that contains up to four small random items. You may take out any one item, and are allowed to view the contents first; after taking out one item the bag and its other contents vanish. Items cannot be put into a grab bag. If you tip it, one random item comes out and then it vanishes.

Command (generalization of #tip, or #dump, have both been suggested) to transfer all items from one container into another container without having to temporarily place them in your inventory. It would be better but perhaps harder to implement if you could pick and choose which items were being transferred, rather than all of them.