How it is important to tell a joke well

A jokes fun club. All the jokes are catalogued and the old members know their numbers. An old member says:
- Five!
All laugh. Another member:
- Twenty four!
General laugh. A newbie, first time in one session, saw that's enough tell the number of a joke, decides to try:
- Sixteen!
Absolute silence. Nobody laugh. One of the old members tells him:
- Colleague, doesn't matter the joke, it's important to tell it well.