Honey Block

Honey blocks are sticky blocks craftable from honey bottles.

Usage
Honey blocks slow down entities walking on top of them and prevent them from jumping. Players, who can ordinarily jump about $1 1/4$ blocks high, can only jump about $3/16$ blocks high on honey. They can more easily step up onto other blocks than jump up onto them.

Entities touching the side of a honey block fall at a slower speed and do not take fall damage, similar to going down a ladder.

When pushed by a piston, entities on its top surface and adjacent blocks move with it. Mobs are not launched high in the air if a piston pushes them up, unlike the slime block's behavior.

As with hay bales, falling onto a honey block reduces the fall damage by 80%, i.e. the player or mob takes 20% of the normal fall damage.

Mobs avoid walking on honey blocks.

Trivia

 * Honey block is 1 pixel shallower than a full block on each side. (Only within this 1 pixel range can a player "stick" to it and slide down vertically)