this happened to me a few weeks ago, I was planning on doing about 123 for 2 sets of 20 on the bench press. I had the bar loaded to 173 from my DE bench. I forgot to deload the bar, so in my mind I really thought the bar was 123. I got 17 reps with 173. Nothing spectacular, but I really think if I knew there was 50 extra pounds on the bar, I wouldn't have gotten that many reps.
James 1:16-17 ESV
Do not be deceived, my beloved brothers. Every good gift and every perfect gift is from above, coming down from the Father of lights
With God's help...Mens sana in corpore sano