Are you even in a situation where you don't quite know how to respond? Well instead of using Supercalifragilisticexpialidocious think about using "I am Groot," a much more versatile response (plus you won't end up married like that one fella).
When you're happy
Don't respond just dance!
When you are explaining and aren't sure how to explain it
You are at a loss for words but you have to say something because you have an idea that you are passionate about.
Yell it
It will throw everyone off.
You forget what you have to do
You're trying so hard and doing great!
When you see something so beautiful
Just stare in aw and mutter an "I am Groot."
When you avoid responsibilities
Just turn on some music and dance away your problems.