"See - tomatoes are poisonous!"
Actually, that urban legend was started in 1597 by a barber-surgeon named John Gerard. Not true then, not true now.
The question is: Is it a fruit or vegetable? It is commonly accepted by the scientific community to be a fruit. However in 1893 the US Supreme Court declared it to be a vegetable. So who should we believe?
But it was believed for many years that tomatos were indeed poisonous.