That suspicious feeling, when everything seems to run as expected on the first attempt.

"Je préfère quand c'est un p'tit peu plus moins calme" (for French connoisseurs)
("I prefer when it's a bit more less quiet")

When I "first try" bits of code I am excited, or I insult myself thinking I forgot a debug return, a if(false) condition or whatever.
It's too suspicious.