Wait for it
Definition 1 of 2
Pro Tip 1/3Building Tension
Used just before revealing key information to build anticipation. 
She moved closer, and I could see she was holding, wait for it, a diamond ring.
Pro Tip 2/3Dramatic Effect
Often accompanies a dramatic or surprising revelation for impact. 
The artist of the painting was, wait for it, my grandfather!
Pro Tip 3/3Informal Tone
Mostly used in casual conversations rather than formal discussions. 
They offered me the job and, wait for it, a company car too!