I'm writing this in spoken language so that you can get used to it. :) 
New vocab are in RED and the meaning is written at the end of the setence in parantheses ( ) 
So here we go! 
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I love to laugh. 
I love comedy shows. 
I love stand up comedies.
but I laugh the most when I'm having classes with my students. 
Because they say the most unexpected things, especially the kids.  

The one conversation that comes to mind was a student of about 6 years old. 
It is not recent, but we were talking about fruits. 
And I asked her what kinda fruit would she invent?  (＝発明する）
And she told me she'd like to invent a "spicy banana." 
At this point I was already giggling to myself. (giggling = うふふ)

So, I'm like "Why spicy banana?" (see grammar here) 
and confidently, she said "because adults like it". "adults like spicy bananas". 
She said all of this innocently of course and I burst out laughing like a madman. (=爆笑する）
I think you know why!
Do I need to explain more? 

So tell me, what is something that made you laugh hard recently? 
Let me know in class and talk soon! :)

was/ were ____ing, when + 過去形

In the middle of an action

We were having dinner when the doorbell rang. 

I was walking home when I met her. 

She was watching TV whenwe arrived. 

It was raining when I woke up this morning. 

Jessica was living in Rome when I first met her.