Vegeta, Goku, Goten, Trunks on the beach. Goku and Vegeta are sleeping, so Goten and Trunks invented them buried under the sand
You can see this scene in ep. 34 of Dragon Ball GT, when Pan wants Goku to remember the time they had spent together. She shows him a picture of all of them at the seaside and some blurred scenes of them playing come after it.
Goku, Vegeta, Trunks and Goten © Akira Toriyama
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