The moment I stopped watching the series
I completely understand that watching this movie (the entire series as well) requires total suspension of disbelief. Everything about it is just so over-the-top fantasy.
But the part that made me stop watching every FF movie afterwards is towards the end of 2F2F, when Paul Walker's character says they have to crash land their car onto a moving boat in order to save Monica Fuentes who is INSIDE the boat. That requires WAAAAAY too much suspension of disbelief for any audience. In reality, the car would just destroy/sink the boat and kill everybody onboard. But in this movie, it is the only solution. SMH.
Glad to say I have not watched any Fast n Furious movie since then. Too much BS even for a fantasy movie.