Funny spotting story-
My wife trains with me sometimes, and she does a great job lifting for a beginner, but she gets REALLY nervous about not knowing certain things or doing them wrong. One day I was benching, and on my last set I knew I wanted a little help getting it in position. I asked my wife to give me a lift-off. She started getting all nervous so I told her "On the count of 3 just help me get the bar over me chest, then help me just a little if the bar stops moving up."
Fairly simple instructions, or so I thought.
I got under the bar, tightened up, arched up, got my grip, then counted to three. She grabs the bar, helps me move it out, then KEEPS HOLDING THE BAR. I summon just enough breath to scream "LET GO!". When she finally does, my breath is all gone and I've got nothing left, so I just drop the bar back into the rack.
When I asked her what the hell she was thinking, she told me the bar wasn't over my chest yet, then said "I TOLD you not to have me do this."