Was beyond fed as nocturne (like 19-3 or so), all 5 enemies were terrified of me and my team, including 2 friends, were reasonably well fed too, i think it was like 43-18 or something. We had just gotten Baron buff and Elder Drake...
All 5 of us walked up mid where they didn't have an inhib turret and about halfway, mid baron minions all stopped and BM'd the everliving fuck out out of the enemy team by all 5 of us backing and stopping the back over and over, with baron sound effect... for like over 2 minutes... during which time the enemy just watched and wouldn't come near us.
After we'd gotten that out of our system we pushed into their inhib and miraculously got aced - mostly cus i jumped their adc way in the back and got caught/cc'd. Enemy team pushed to our inhib (from 1st tier mid) then we died again trying to defend and lost.