1. Letting both your 1-year-old and 2-year-old into the shower with you. Unless you weren’t intending to shower, then it’s a fine idea.
2. Not using a shopping cart with previously mentioned children and thinking you can carry the 1-year-old and that the 2-year-old will miraculously not pull everything off the shelf/run for his life.
3. Letting your 2-year-old son run naked. Seriously.