I would say you need to re-think about the purpose of a re-call. When you say "super-serious" ...they all are!! Really anything that is considered for a recall is going to be serious to someone. Either to the person potentially being affected by whatever is wrong with the product, or by the company's image of a poor quality product hitting the market.
Whatever the reason - a company is not going to recall a product just "because". There has to be some serious implications. The FDA does a nice job of outlining classes and what is involved in each one - see below... If you are interesting in how others have handled it - there are some nice threads on this site about others who have gone through them and what they did.. I'll try and track down one.. but here are the recall classes with a little summary of the levels.
The Food and Drug Administration (FDA) requires all food companies to have a written recall program in case any products need to be recalled. This procedure outlines the condition under which a recall will be initiated, delegate’s responsibility for implementing the various steps of the procedure, and specifies the necessary steps to be taken in the event withdrawal of our product from the marketplace is required.
II. CLASSIFICATION OF RECALLS
1.CLASS I RECALLS - Involves a clear and immediate danger to health. There is a reasonable probability that the product may cause illness or death, requires recall to the consumer level, individual consumer notification, and 100% effectiveness checks.
2.CLASS II RECALLS - Involve products that, though they could pose a threat to health and safety under certain circumstances, are not regarded as immediate hazard. This usually requires recall to the retail level, possible public warning and some level of effectiveness checks.
3.CLASS III RECALLS - Involves products that are relatively safe in consumer's hands, but which violate some specific regulation and are thus legally required to be removed from the marketplace. Such a recall could involve recall to the wholesale level, no public notification, and no effectiveness checks.
Serious Container Hazard - Safety-related problem due to faulty packaging materials.
Market Withdrawal - Quality failure with no safety or regulatory hazard and product is only suspect (not classified as a recall by the FDA).
Stock Recovery - Can be any of the classifications of recall, but the stock was not released for distribution.