We've all got bad habits when it comes to crafting -- those little things we do that make our crafting lives harder, but that we just can't seem to stop doing.
Personally, I have "startitis" -- I cast on project after project, no matter how many I've already got going on. As a result, I've got dozens of UFOs hidden around my apartment. Some I'll get to, but there are lots of others that will never be finished! It's something I really ought to work on, because it can be a little overwhelming to know I have all these half-knit pieces staring at me from every corner of the room.