Bobby's Mom Appearances (Other than Episodes 200 & 300)

I don't know if I'm misremembering, but is there an episode where Bobby's Mom makes a brief appearance (not including episodes 200 & 300) and there's a guest and they're going over Korean words?

I think it was in the normal studio. I can't seem to find it though so I might be mistaken. If anyone knows or if I'm close please let me know. Thanks.