Looking for a pretty simple plugin but…

I couldn’t find it anywhere.

I used to have a simple but cool plugin two years ago that was really useful. Sometimes I have pretty long texts to write but they take a lot of vertical space in my layout. To avoid it, I simply hid most part of the text in a tag ([hide][/hide]) and when reading the post you just had to click the button “Show” to read the text that was hidden. Simple but effective.

Does anyone know where I could find this holy plugin?

Thank you in advance.
Tiago.