What are your duders favorite seeds? Please say what version of Minecraft the seed is for and a description.
Mine is 404. There's a gravel patch near the ocean. When you hit or place a block on it the whole thing collapse. It opens up a huge cave. There's a 404 challenge where you have one day to collect resources from up top. As soon as it's night you must return to the hole and survive underneath in the caves. It's a fun thing to do when you're bored and or with friends. This works for 1.7.3 but I have heard of it working in later versions. So try it!