Yeah, the first one's gotta eat it.
4 seconds sound clip from the Tarzan (1999) movie soundboard.
You can hear this line at 00:14:04 in the Blu-ray version of the movie.
Quote context
[...]
- You are such a wise and caring leader.
- Run.
- Hello. Are you thick in the head? How many times do I have to tell you?
- If you want Kerchak to like you, stay away from him.
- Last one there is a dung beetle!
- Yeah, the first one's gotta eat it.
- Well, you could if you could keep up, but, you know, you can't really keep up.
- Wait up, guys! Wait up! Right behind you!
- You're standing on my spleen.
- Stop hitting yourself. Stop hitting yourself...
[...]