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.
Having a well-kept, short lawn and occasionally mowing wet grass is better than allowing your lawn to go to seed and become unmanageable while waiting for the rain to clear. Sharp mower blades, mowing height, cutting speed and clipping disposal are all important factors when cutting a damp lawn.