Something's Not Quite Right!

I left the house early for work this morning, but it was already pretty hot when I got outside. I returned home around 4pm, collected the boys and took them to my folks' place for a swim.

While they were busy swimming, I went inside to fetch something from the kitchen. As I walked passed the back door, these two were standing there looking at me with faces that said: "There's something very wrong with this picture... why are you inside and we're not?! You can run, but you can't hide..."