Planet Abilene

• Shotgun
  • The engineer performs a hoedown while yelling:
    • "Woooo hoo!"
    • "Heeeey ya!"
    • "Yippee ki yaa he yay kyaaah kayo!"
    • "Hee hee! Yeehaa!"

• Pistol
  • The engineer twirls the Pistol in his hand while chuckling menacingly.

• Wrench
  • The Engineer laughs evilly, slaps his knee and points.

Information obtained from TF2-Wiki