"Bad Luck" is a song that Littlefoot, Cera, Ducky, Petrie, and Spike sing when the Great Valley is apparently having bad luck in The Land Before Time VI: The Secret of Saurus Rock.
Lyrics
Littlefoot: If the mountain starts to blow its top
That's bad luck
Ducky: If the sky water falls and it just won't stop
That's bad luck
Cera: Ugh!
If your feet get caught in bubbly goo
And you're stuck no matter what you do
Petrie: If a spike tail sits on top of you
All together: That's bad luck
Littlefoot: Hit it, Spike!
Spike: Ba-ba ba-ba, ba-ba ba-ba
Ba, ba-ba ba-ba
Cera: If the log falls down when you cross the creek
That's bad luck
Others: Bad luck
Ducky: If a bee leaves a boo-boo on your beak
That's bad luck
Others: Bad luck
Littlefoot: If a big wind comes and blows and blows
Petrie: And drops a rock right on your toes
Ducky: If a fuzzily bug flies up your nose
Others: That's bad luck
Spike: Ba, ba, ba
Others: Bad luck
When things go wrong
And you feel just like you're cursed
Spike: Ba, ba, ba
Others: Bad luck
Ducky: It could get better
Cera: Yeah, but it's gonna get worst first!
Littlefoot: When an earthshake scrunches up your home>
That's bad luck
Others: Bad luck
Cera: When a sharp tooth finds you all alone
That's bad luck
Others: Bad luck
Littlefoot: When he chases you into the stream
Petrie: And your mouth won't work when you try to scream
Ducky: And you're stuck in the middle of a very scary dream
Others: Aah!
That's bad luck
Spike: Ba ba-ba, ba-ba ba-ba, ba-ba
Others: Bad luck
Spike: Ba ba-ba, ba-ba ba-ba, ba-ba
Others: That's bad luck
Spike: Ba ba-ba, ba-ba ba-ba, ba-ba
Petrie: Bad
Littlefoot: Bad
Cera: Bad
Ducky: Bad
All Together: Luck