Nephew accidentally put smaller water filter in fridge & is now stuck?

Nephew accidentally put smaller water filter in fridge & is now stuck? My nephew is not stuck, the water filter is. He replaced the filter with a smaller one that is not supposed to be put in the fridge and now its stuck. Is there any to get it out from under the refrigerator? The only physical way seems to be turning the whole thing upside down, but it's a small space in our house and would be extremely difficult to do.