How to de-seed a watermelon?
There are several hits on google, and many videos illustrating how to de-seed a watermelon.  Most have you cut the watermelon length-wise to expose the rows of seeds, which are generally in a circle down the center of the melon (imagining the pattern if you were to look through the end).  When you cut lengthwise, you expose the rows of seeds.  I prefer to remove both ends, and the rind first.  Then, slice in length-wise wedges.  You can often hold a wedge in both hands and gently break it along the line of seeds.  You can also cut the seeds out fairly easily this way, and create seed free pieces closer to the peel.  However, there is quite a bit of melon surrounding the seeds.  That, you just have to work at.