Rousing speeches on the spur of the moment require truly inspired roleplaying. But they can be crowning moments of awesome in a campaign, if you manage to pull it off.

For this reason, you should keep a notepad of suitably rousing speeches, sorted by context, handy in case your character ever gets the opportunity to deliver one.

In a personal anecdote, I (DMM) once ran a game in which it became clear that a significant NPC would have the opportunity to give a rousing speech during a future game session. So I actually did write one. Furthermore, I timed the speech to match a particularly rousing piece of music - it was many years ago and I honestly don't recall exactly what piece it was any more, but it was timed so the climax of the speech hit the crescendo in the music. I read the speech out carefully, in time to the music... and it was seriously awesome.

Give it a go next time you have a chance.

Transcript

Yoda: Listen up, clones!
Yoda: These Jedi we must save.
Yoda: Form a circle around them and keep the droids away.
Yoda: Your thoughts I sense: It's a big drop!
Yoda: But Jango flew around with a jetpack, and you're all like him. Fine you will be.
Yoda: Droids are not so tough. They get their heads chopped off all the time.
Yoda: But don't let your heads get chopped off.
Yoda: Some of those Jedi are really careless!
Yoda: Now go! Fly, my pretties!
{The clone ships attack the droid army in the arena}
[SFX]: Pow!
[SFX]: Pow!
[SFX]: Pow!
GM: Wow Sally, that was really... inspiring.
[SFX]: Pow!
[SFX]: Pow!
[SFX]: Pow!
R2-D2: And she's doing the voice better than you.
GM: Up, shut.