[the Z-Fighters go back in time]
Krillin: Wow, this is where Goku and I trained under Master Roshi! Isn't that right, Goku?... Huh? Where's Goku?
[Goku pets his younger self]
Son Goku: What a good, good boy...
[Trunks tackles Goku and pulls him away]
Trunks: Goku, don't do that! Didn't I explain it to you?
Son Goku: Sorry, sorry...
[young Goku looks around, confused]
Son Goku: That guy looked familiar, where have I seen him before...?