For the more demonstrative roleplayers in your group, ensure you have a ready supply of something relatively light and harmless at hand. Dice can really hurt.

Transcript

[SFX]: Whooom!!
{Vader Force throws boxes and equipment at Luke}
[SFX]: Throw! Thud!
[SFX]: Throw!
Darth Vader: I'll show you the power of the mind!
[SFX]: Kzzrzzkk!
[SFX]: Throw! Krak!
[SFX]: Whooom!!
Darth Vader: I!
Darth Vader: WILL!
Darth Vader: SHOW!
Darth Vader: YOU!
Darth Vader: THE!
[SFX]: Throw!
[SFX]: Whooom!!
[SFX]: Thump!
Darth Vader: POWER!
Darth Vader: OF!
Darth Vader: THE!
Darth Vader: MIND!
[SFX]: Throw! Smak!
Luke: I get it! You can stop throwing pretzels at me, Annie!