Both if these commands seem to be a little glitched, even though they're not completely broken: /minecart spawns you in a pretty awkward position in the minecart and I think the minecart is slower than it should be (probably the speed of an empty minecart). /boat works fine except that when exiting, it often teleports up to 20 blocks in a random direction. Also, the boat doesn't get destroyed when crashing into something (not sure if intended). Important note: Why am I unable to add paragraphs?