Any ship can be done with this-

1: Character 1 is searching for supplies (alone or with others is your choice-) when they meet Character 2

2: Characters 1 & 2 are at home watching the news when an emergency broadcast is sent through all media warning about the apocalypse

3: When Characters 1 & 2 are at an outside concert, some of the other guests start acting strange, then attacking  more bystanders

4: Custom!