Surround Sound allows some neat effects, like hearing that creepily dangerous sound from behind you instead of from the screen... but sometimes there can be additional words hidden in the other channels that you otherwise mightn't be able to hear. When Kristoff brings Anna to meet his friends (well, they're more like family), he greets them all, in several cases by name. But since the audience's attention is on Olaf and Anna ("He's cray zee!"), the actual lines are easily lost. Here's what Kristoff is actually saying...
You are a sight for sore eyes.
Hey look, Magma's back from vacation!
Rocko's looking sharp, as usual.
Clay, whoa... I don't even recognize you. You lost so much weight!
Didn't realize how much I missed you guys.
Guys, I've got so much to tell you.
Stop kissing Crystal and find Grandpabbie!
So now you know. And knowing, as they say...