That's what makes this interesting..."it's impossible to prove"
Do we all, at one time or another, act a bit "odd"? Then is it normal to act odd? If it's normal to act odd, then it's not odd to act odd.
If it's normal to act odd, is it odd to act normal? What you might consider odd, may seem normal to me.
If you think this line of reasoning is odd, that would be normal.
All this reminds me of a song. Aren't you the least bit curious what it is?
That's normal
https://www.youtube.com/watch?v=aoyAg75PsTA