Seagulls are definitely the least of Luke’s problems but who knows which kind of dangers he will face in Episodes VIII and IX.
R2D2, who stayed by Luke’s side when crashing in Dagobah, didn’t save itself from Yoda’s “Seagull” song and was used by the Master as a drum set.
In the end, all that Yoda was doing was warning Luke about the dangers of seagulls – not that he would need that kind of advice, but it’s appreciated, even if it put his patience to test.
Bad lip reading is always fun but if it includes a funny song with a catchy tune it can guarantee hours of entertainment – mainly because people won’t be able to take that song out of their minds in a while.