DuckTales, Season 1

Webby:
You still haven't told your brothers what we found out about your mom?

Dewey:
Tell them what exactly? She took the Spear of Selene? We have no idea what that means. We don't even know what it looks like. Why get them in a panic when this could all be a dead end?

Webby:
Because... honesty?

Dewey:
[looks deep in thought] Mmm... mhmm... mhmm... mhmm...

Webby:
Why do you always do that?

Dewey:
Do what?

Webby:
Whenever you want to ignore something, you stare into the distance and pretend you're thinking.

Dewey:
I'm trying to protect my brothers from finding out something that could upset them.

Webby:
And keeping an earth-shattering secret from them that could destroy your brotherhood wouldn't upset them?

Dewey:
[looks deep in thought] Mmm... mhmm... mhmm... mhmm...