Future Trunks seeing Kid Vegeta meet Bulma!! So cute!!! Trunks tries to travel back to when parents first met (on Namek), gets time wrong, but discovers they really did meet as kids, Kid Vegeta and Raditz have come to Earth to get Goku. Kid Bulma zaps Raditz with ray gun, Vegeta panics and flees.

Vegeta: “You built that ray gun yourself? How old are you?”

Bulma: “5" 

Vegeta: "5?! Then the army here must be crazy strong!”