When a player presses 'shift' (sneak) while standing on a bed other clients (connected to the LAN world) will move the player model down (not the hit box).

Screen1: both players standing on bed (not shifting, note the black pixels on the legs of the right player)
Screen2: connected client shifts, other clients see player moving down into the bed (you can see there are black pixels missing on the legs)
Screen3: other client also shifts, no displacement (because it renders correct on own client, not on other's client)
Screen4: both clients shift (right player is client where screenshot was taken so his model renders on top of the bed, other player is again a few pixel too low)
Screen 5: both clients no longer shifting (note the black pixels that appeared on left players skin [were inside the bed])