Mobs that get stuck in mud blocks.

How about adding some more features to the mud block. Some ideas are when some animals get trapped  in the block The animal sink under the mud blocks and suffocate to death. However When you get trapped in the mud block you can escape it by constantly moving. and when mobs get trapped in the mud block they sink under the mud block but when you come near the mud block they come out and attack you. Only you and pigs can get out of the mud block that traps you. When pigs get trapped into the mud block it turns them into a muddy pig after the pig escapes. What do you think?