Not sure how to tag the Jack-o-lantern face she's got on her stomach.

Granted, this is the only time you'll see a smile on her....

What's Ruktun?

Keo said:

What's Ruktun?

This seems to be the title of a song from 1999.
http://dic.nicovideo.jp/a/ruktun%20or%20die

Jarlath said:

This seems to be the title of a song from 1999.
http://dic.nicovideo.jp/a/ruktun%20or%20die

Going by that article…
Specifically, it’s a song by Yūko Miyamura together with Susumu Hirasawa, who later did a self-cover version. More properly romanized luk thung, it apparently means "pop song" (specifically, country/enka style) in Thai. Miyamura and/or Hirasawa apparently heard of a Thai music festival involving the high-tempo mor lam style of songs, "so fierce they could raise the dead", and thus got the idea for the album title.

Jarlath said:

Granted, this is the only time you'll see a smile on her....

I always envision Muppo smiling everytime she does not have a scowl or frown on her face.

Like this one.