Because Japanese don't know how to write in English.
Movie 2: Return My Gohan!!
Movie 6: Clash!! 10 Billion Power Warriors
Movie 7: Extreme Battle!! The Three Great Super Saiyans
Movie 8: Burn Up!! Hot Fight! Fierce Fight! Super Violent Fight!
Movie 9: The Galaxy at the Brink!! The Super Incredible Guy (lol)
Movie 12: Fusion Reborn!! Goku and Vegeta
TV Special 3: Dragon Ball Z: Zetsubō e no Hankō!! Nokosareta Chō-Senshi Gohan to Trunks
Movie 14: Yo! Son Goku and His Friends Return!!
2 exclamation points