Biggest dinosaur mismatches

Ornitholestes (yelling at the top of his lungs):  You nasty T-rex, you bully, you, you....

T-rex (staring awkwardly at Ornitholestes, hearing little squeaks): Um.... (SPLAT!!)

Hahahah. you and I both know that if a ornitholestes and a t.rex ever fought who would win*hint,hint* ornitholestes.

Spinosaurus vs Velociraptor

Tyrannosaurus Rex vs me (as much as I love Rex, it's going down. Every. Time)

With out a gun................

Of the powder burning kind, correct? Because I've got two other guns that do not fire a projectile at high velocities towards my target. 

Well, name some more mismatches.

Argentinosaurus vs Deltadromeus 

Anchiornis vs Tyrannotitan

Daspletosaurus vs Micropachycephalosaurus

acrocanthosaurus vs troodon.

megaraptor vs microraptor.

Tyrannosaurus vs. Leaellynasaura

Dreadnoughtus vs. Microraptor

Ankylosaurus vs. Compsognathus

Spinosaurus vs. Pyroraptor

Spinosaurus vs Epidexipteryx (in favor of Epidexipteryx)

Amphiceolias vs any other dinosaur.

Daspletosaurus vs Tyrannotitan(Tyranno)

Torvosaurus vs Giganotosaurus(Giga)

Saurophaganax vs Brachiosaurus(Brachi)

hmm, i don't think das vs tyrannotitan would be a mismatch, that would be a good fight. As for torvo vs giga, torvo is just edmarka, and i believe it was you who wrote edmarka vs giga... and edmarka won?! as for mismatches... diplodocus vs pachycephalosaurus

gallimimus vs utahraptor (x 20)

me vs everyone BWAHAHAHAHAHAHAHAHAHA

and do they all have to be dinosaurs? if not, then megalodon/any shark/dunkleosteus/liopleurodon/mosasaurus/kronosaurus/tylosaurus vs goldfish