It may not be allowed to avoid subsequent use of one ticket by multiple people, or even simultaneous use by giving the ticket to someone before the ticket check (if this is physically possible), but it may also be allowed, e.g., in a movie theatre to allow the stub holder to use the facilities (restroom, telephone, water fountain) or buy, during a movie, a snack or drink before the ticket check and reenter.
It may not be permitted to reuse one ticket by multiple individuals, or even give it to someone before checking (if feasible), but it might also be allowed, e.g., in a movie theater, allowing the holder of the stub to use facilities such as restrooms, telephones, and water fountains, or purchase snacks or drinks during a film without needing to check the ticket again.