Perms and hair color. You can color hair that has been permed, but try to use a semi-permanent or 'no-ammonia' color instead of a normal permanent color (which uses ammonia and 20 volume peroxide). Have your hair permed first.
Mowing grass works best when the grass is dry, as grass tends to bend over from the weight of the rain, making it difficult to get a straight cut. It also clumps inside your mower cavity and on your lawn, which can lead to dead grass underneath the clumps if not raked promptly.
Cut the grass only when the grass and soil are NOT wet. Mowing when the ground is wet can lead to damaged roots and grass that may prohibit proper germination and growth. Since most new lawns require constant water saturation for their first weeks/months, try to mow during the driest period in between waterings.