न लङ्घयेद्वत्सतन्त्रीं प्रधावेच्च वर्षति ।
न चोदके निरीक्षेत स्वं रूपमिति धारणा ॥
- मनु स्मृति
You must not cross the rope used to tie a calf. (because the calf may be scared and try running away. This may hurt the calf. You may trip over the rope). You must not run when it is raining for obviuous danger of slippery landscapes. One must not see his own reflection in water (deep water. One of the common effects of doing so is 'vertigo').
- Manu Smriti