How does this happen???

Mayfield issues recall for ice cream
Atlanta Business Chronicle
by Lauren B. Cooper

Mayfield Dairy Farms said it is voluntarily recalling containers of its vanilla ice cream that may be contaminated with ammonia .

The ice cream manufacturer said Wednesday that the recall includes more than 14,000 units of its 1.5-quart Mayfield Homemade Vanilla Select Ice Cream.

The product may contain ammonia, the company said in a news release, which could cause headache, nausea, vomiting and irritation of the throat.

It said the product was distributed through numerous retail outlets in Alabama, Tennessee, Mississippi, Georgia, Kentucky, North Carolina, South Carolina and Florida.

Possibly contaminated containers will have a code date of 03/17/10 and plant code of 010176, found on the lid.