Here is a list of vegetarian food items we consume on a daily basis that may not be vegetarian after all.
Bananas
If you want to have vegetarian bananas, your best bet is to go the organic way.
If you can't, then be prepared to eat bananas that are sprayed with shell-fish based pesticides. It is used to fight bacteria and extend the life of the fruit.
These pesticides are known to get infused into the fruit.