Technique 1: The Flail
Flail your arms like a madman, spin around like a top, and make "whooshing" noises to emphasize the point.
Technique 2: The Stomp
Stomp your foot like you're trying to stomp out the fire of boredom, and make sure to stomp with conviction!
Technique 3: The Wriggle
Wriggle your fingers like a snake on a hot summer day, and make "squirting" noises to add an extra layer of emphasis.