Potatoes, tomatoes, sweet and hot peppers, eggplants, paprika, gogi berries, and ashwagandha (aka Indian ginseng, poison gooseberry, or winter cherry) which is available in supplement form (as a powerful and natural remedy for stress, anxiety, and insomnia), as well as tobacco. They're all part of the nightshade family, and contain a (glycoalkaloid) poison called Solanine (Tomatine in tomatoes), which is a natural plant defense against predators and disease.
Solanine poisoning primarily affects the digestive or neurological systems. Symptoms include nausea, diarrhea, vomiting, stomach cramps, burning in the throat, cardiac dysrhythmia, nightmares, headaches, dizziness, and sleepiness. In more severe cases - hallucinations, loss of sensation, paralysis, fever, jaundice, dilated pupils, hypothermia, and death.
Interesting to note that solanine is considered "teratogenic", meaning it can cause birth defects, but there's warning to suggest pregnant women avoid potatoes.