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.
Turf may have a gray to brown cast following mowing. In most cases this discoloration can be attributed to dull rotary mowers, although reel-type mowers may cause the same kind of damage. Basically, the discoloration is due to tearing, splitting, or shredding of the tips of the grass blades.