Depends on what I get stuck on, and how bad it is. Taking a break to clear one's head can help a lot. I also found that postponing the problem, and doing somet

Depends on what I get stuck on, and how bad it is. Taking a break to clear one's head can help a lot. I also found that postponing the problem, and doing something completely unrelated allows my subconciousness to dream up an idea. If the situation permits, seeking help from fellow team members (possibly combined with one or more of the above) should also be a routine. There's also the sitting down, rephrasing the problem, the current status - preferably to someone who has no clue about it, but can listen well. A plush toy works wonders: by systematically going over the whole thing, to an audience who doesn't have a clue, one might just see the problem from a different angle, which in turn has a good chance of giving one a new good idea.