The rules of TheJokeFactory are very simple:

1. All postings and material must be humour related.
2. You mustn't be offended by any sort of humour (even very old jokes!).
3. You post any humour you receive from elsewhere to the list.
   Remove all advertising and E-mail headers before sending the message to the
   list.
4. No advertising is permitted except that from the list server provider.
5. Don't post attachments of any sort as these will be stripped by the list
   server (if possible). Instead, subscribe to TJF-attachments and send them to
   that list instead. By subscribing to TJF-attachments, you agree to being sent
   possibly large, attachments of any type and content! TheJokeFactory will
   upload suitable attachments to its Web site and then broadcast the
   appropriate URL.
6. Please ensure that attachments sent to TJF-attachments that are copyright have
   their copyright stated.
7. Put large files on your own Web site somewhere and send a message to
   TheJokeFactory list that contains the URL of the file(s), their size(s),
   platform requirements and a brief description.
8. File description should provide enough information for members to decide 
   whether or not the content may offend them. Disclaimers are not good enough;
   if you don't know what you're uploading, then who knows what laws you may be 
   breaking.
9. For help setting up a Web site ask the list administrator.


Just use your common sense. OK rule 0. you must have common sense.
This isn't supposed to be the ultimate joke list and should be relatively low 
volume.
Just don't send anything that will get the service taken away, and show 
respect for other users of the list.