Long time no see

Every now and then, me and my great dad used to get out these model planes and
cars. This must have been at least 5 years ago. Anyway, we got them out today for a little blast from past.They were all covered in dust! To be honest, we didn't do much today.

Knock knock
Who's there
Sombrero
Sombrero who?
Sombrero the rainbow!