"Crazy laws" (also known as "stupid laws", weird laws", "unusual laws" or similar) are a pop culture phenomenon going back at least to the 1990's that consist of wild, typically unsourced claims that certain jurisdictions have bizarre or absurd laws in their statute books. Many "crazy law" books and articles liberally cite each other as they weave a tangled web of citations. These claims are very interesting from a Skeptics perspective as they have not only been around for decades but originate in a combination of complete fabrications, mangled misunderstandings of real laws, and obsolete laws that were repealed after the reasons for them existing ended. Tracking each of them to their original sources is a very difficult challenge indeed.
Research into these questions tends to look like this (made-up example, but based on real such claims):
Claim: It is illegal for children in Podunk County to drink imported milk.
Reality: A 1982 regulation of the Podunk County Board of Education (currently codified as Regulation 44.3 here: [link]) requires local public school lunch programs to purchase milk from local farmers. Local is defined as anywhere in Podunk County, Green County, Smith County, or any jurisdiction sharing a border with any of them. There are exceptions when local milk is not available, and the regulation does not apply at all to private schools, grocery stores, restaurants, or private homes.
Examples of actual crazy law questions here on this site are Is it true that in New York City there is a special law stating "It is Illegal to break the law"? and Is it against the law to mispronounce Arkansas?
These questions are typically tagged with law, but that tag also includes many questions of a more mundane variety - questions about claimed laws that are relevant from a Skeptics perspective but do not fall under the "crazy laws" phenomenon.
An example of a non-crazy law question is Is it illegal to air a prank call in the United States because of FCC regulation?. It is a question about law that relates to a claim that is in-scope for Skeptics, but the claimed law is neither bizarre nor part of the historic "crazy laws" copypasta phenomenon.