The best part: Shaggy suddenly became a super-good fighter because of hypnosis. So, what was its effect? Did it make him faster, did it give him the skills of a martial arts master, did it...? Nope. It just turned off his cowardice. That's all. That was just normal Shaggy when he's not afraid.
As far as we see, Shaggy doesn't even throw a single punch... because he doesn't need to. He simply trips them up, redirects them into each other, uses improvised objects to stop them in place/push them away, and only occasionally uses more physical means (like keeping one guy in a headlock as he returns the trophy) - in other words, he was barely trying at all and still mopped the floor with them all.
To add more awesome points, this single scene is what inspired MultiVersus. Warner Bros. themselves confirmed that this single bit of animation was enough to put into production a massive crossover fighting franchise. How many pieces of media can say they've had a single scene do that?
Not to mention Shaggy managing to win his motorcycle race and take down the Phantosaur, despite never riding one since last night. Daphne must be a really good teacher.
While Tex is on his bike, he manages to nail a velociraptor in the face!
The entire biker gang get some pretty good moments during the dinosaur attack.
During the Phantosaur's first attack, Scooby saves Shaggy in a pretty remarkable chase between the monster and a railway car He gets a little help from Fred, who rams the Phantosaur with the Mystery Machine, knocking it off a cliff as it's about to chomp down on Scooby. Points also go to the amazing CGI during the sequence.
The Phantosaur's fiery form towards the end is pretty impressive.
Shaggy and Tex's motorcycle race. Sure, Shaggy was under hypnosis at the time, but that's still something you never thought you'd see Shaggy do.
Velma gets a small one when she uses Windsor's keychain and a phone line to keep Scooby and Shaggy from dying in a motorcycle crash.
Shaggy managing to save everyone from the collapsing cave without being under hypnosis. After a speech from Fred that helps him realize that all of his cool moments were entirely within his capability, Shaggy jumps half of an underwater river stream In a Single Bound, and when forced to climb for his life, he leaps from rock to rock in mid-air repeatedly to clear it to the top. Holy crap.
Most people would lose their voice after screaming for more than ten minutes. Shaggy manages to scream for three consecutive hours without any ill effects.
A fan-edited edition with DBS's music and effects can be seen here.