In Delfino Plaza, there are plenty of manholes you can mess up. This can be difficult to do, and it may not work with every manhole. Stomp on the manhole and then try jumping out of it weird-ishly. This means jumping and hovering right before you come out of it, jumping at weird angles, and jumping in and out repeatedly. Doing these things can make the manhole act strangely. For example, without much trouble you'll make the manhole flip its cover picture erratically, sometimes suddenly switching from Sun to Moon or visa versa. Also, when you jump out of the hole, you will sometimes suddenly appear on the top instead of fly out of the hole. Also, if you hover and jump out of it at the same time, you can get the manhole to flip twice. However, if you fiddle a lot with it, the manhole will stop functioning properly. You will not need to stomp on the manhole to get in; you just fall through it when you get near it. You can even hang on to the edge of it. You can do many things with these holes and mess them up to many different degrees... try stuff out!
Submitted by: kornyhatemachine