This is a funny meme because the two pilots are both double fisting whiskey while flying the plane. The caption says "don't worry, that's not turbulence" - implying that the flight is getting a little bumpy. However, upon closer inspection, the sub-caption says "now serving unlimited quays + whiskey". Therefore, we know that the flight is getting bumpy because the pilots are indulging in this offering of unlimited quaaludes and whiskey. We end up understanding a little bit more about the vibe, tone, and humor of 747 airlines.