<p>I'm Japanese but it's incomprehensible little bit to me too.
髑髏 (しゃれこうべ) is not usual word in these days and sounds little bit strange (goofy, should I say?). We use 頭蓋骨（ずがいこつ）to mean "skull".</p>

<p>It's just a joke without any reason. but somehow it's funny in certain situation, like tense situation or lifted up at midnight on trip. Because, there's no reason.</p>

CC BY-SA 4.0
2019-04-11T02:12:17.530Z
2019-04-11T02:12:17.530Z
hirokiky
<p>In the episode 4 of the second season they keep laughing randomly when words like "skull" etc are uttered. I don't understand the rationale behind it.</p>

<p>Note- I am watching Japanese audio, English subs.</p>

CC BY-SA 3.0
2017-02-05T22:50:55.173Z
I think they're just being weird to break up tense situations. The words Ritsu says are 髑髏【しゃれこうべ】 "skull" and リコピン "lycopene", apparently.These words sound a little bit intrinsically amusing to me, I guess? See also: http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1040907955
senshin
CC BY-SA 3.0
2017-02-06T18:55:36.160Z
Recently watched the 3rd school festival episode. It was a very emotional moment, but the writers broke it up very well with 'lycopene', I wonder if the field trip episode reference was to set up this moment. Anyways, it was one  of the strongest anime moments for me. Arigato, sensei @senshin chan.
Akshat Batra
CC BY-SA 4.0
2018-06-26T16:27:02.277Z
the joke is that Ritsu is imitating Kansai's accent, so she throws words at random but with that accent.
Jachosux
<k-on>
Why do the girls keep laughing at word like "skull" during the field trip?
# Why do the girls keep laughing at word like "skull" during the field trip?
Posted by: username_0 on 2017-02-05
In the episode 4 of the second season they keep laughing randomly when words like "skull" etc are uttered. I don't understand the rationale behind it.

Note- I am watching Japanese audio, English subs.
**Tags:** k-on
> **Comments:**
> **username_1**: I think they're just being weird to break up tense situations. The words Ritsu says are 髑髏【しゃれこうべ】 "skull" and リコピン "lycopene", apparently.These words sound a little bit intrinsically amusing to me, I guess? See also: http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1040907955  
> **username_0**: Recently watched the 3rd school festival episode. It was a very emotional moment, but the writers broke it up very well with 'lycopene', I wonder if the field trip episode reference was to set up this moment. Anyways, it was one  of the strongest anime moments for me. Arigato, sensei @senshin chan.  
> **username_2**: the joke is that Ritsu is imitating Kansai's accent, so she throws words at random but with that accent.  
---
## 1 answers
### Answer by username_3 on 2019-04-11. Score: 3
I'm Japanese but it's incomprehensible little bit to me too.
髑髏 (しゃれこうべ) is not usual word in these days and sounds little bit strange (goofy, should I say?). We use 頭蓋骨（ずがいこつ）to mean "skull".

It's just a joke without any reason. but somehow it's funny in certain situation, like tense situation or lifted up at midnight on trip. Because, there's no reason.
---
