“You won’t regret this.”
“It’s a sure thing.”
Don’t worry!
I’m feeling lucky today.
What could go wrong?
Before you die, let me reveal my elaborate world domination plan.
Well basically any statement that has
“XXXXX, BUT…”
Then there is
“It looks good on you”
“Let me be frank” (translation: mean)
“It’s not you, it’s me.”
As George from Seinfeld says:
“If someone ever says to you, ‘It’s not you, it’s me’, you can better believe it’s you.”
Almost every time someone says “That’s…that’s impossible!” while looking at a display screen.
Noting something’s impossible that you see with your naked eyes has generally better results, oddly enough.
“You haven’t told anyone back at the precinct about this yet, have you?”
Which time?
Said by the cops:
“Sir, I’m gonna have to ask you to step out of the vehicle.”
(Not that I’VE ever heard it. That’s the way my “friend” said they approached him. 
)
“They’ll NEVER get in! This place is locked up tighter than Fort Knox!”
“No one can move that fast!”
(Usually uttered just before “fast guy” cleans your clock.)
“I frisked him. He’s clean.”
“Oh, it’s just you.”
“Did you hear that?”
Dan Akroyd in Ghostbusters: “LISTEN! Do you smell that?” (Again, no YouTube link. Seems I do not have mad YouTube skills.)
Paraphrasing Picker: In the South, it is not uncommon to hear “hold my beer, I’m gonna try sumthin’."
“But I’m your friend!”
“What? It’s only going to be a small explosion.”
…and I’m sure somebody’s probably mentioned “Trust me.”
“Is your name Sarah Connor?”
It’s not you, it’s me.
You folks need a lift?
Relax, my parents won’t be back for hours.
It’s okay, I’m on the pill.
Huh, it’s never done that before.
(S)He’s standing right behind me, isn’t (s)he?