Immenseknowledge.blogspot is reporting that the grandfather was horrified after he found the condom in its unopened plastic wrapper inside a small sports bag that came with the meal.
"The fact my granddaughter was going to look in the bag and find this thing - it was going to be difficult to explain, really. She's only seven."
The manager took the condom and gave her a pencil case. They say they are investigating.
I can't see how it happened unless someone at the restaurant was having some fun. Of course it could have been someone anywhere along the chain as it made it's way to McDonalds.
Sounds like the grandfather intercepted it in time, before the girl really noticed.