Under the Shower
Standing directly under the shower head in your bathroom is convenient since it leaves both your hands free.
However, it is detrimental to the health of your scalp and hair, especially if the water is warm or hot. This is because water flowing directly out of the shower head goes straight to your crown and damages the scalp in that region, leading, in time, to the thinning of your hair there.
So try to avoid this as best as you can and remember to shampoo everyday!