Magnetic Field or Uranus
Uranus has one of the most unusual orbital characteristics in the solar system. In contrast to most other planets, Uranus's axis is almost parallel to its plane of orbit! That means, instead of like a ball spinning on the ground while moving in a large circle, Uranus is more like a barrel, rolling on its side in a bigger circle. The cause of this peculiarity is unknown, but one theory presents it as being the result of a collision between a massive body sometime in ts past. Thus, with the planet's south pole pointing toward the Sun, Uranus receives more solar input in that area than it does on the equator! However, an unusual fact is that the equator is still hotter than any other area of the planet, a phenomena that remains currently unexplained.
As a result of this tipped axis of rotation, Uranus has a magnetotail that is twisted into a long corkscrew. The tail is tilted at a 60-degree angle, off-center from the planet's axis. It is even surprising that Uranus has a magnetic field, since new evidence has thrown out the theory that an electrically conductive sea of ammonia and water exists in the interior of the planet. The cause of the tilt in its magnetic field is probably due to interior activity not too far from the surface.
On an interesting note, the labeling on the poles of Uranus has been the subject of debate for quite a while. Either the planet rotates directly with an axial inclination of 90 some degrees or he opposite. This battle is due to the fact that the planet's sideways orientation with respect to its orbital axis.