I was told that back in the 1950's there was a US Navy enlisted man who was learning to fly a Piper Cub at Lindbergh Field. One day the tower cleared him to take off right behind a C-124. Fortunately he did not get very high off the ground before he hit the wake turbulence, which folded the wings up like someone clapping.
An investigation cleared him of any wrong doing and a month later he was ready to resume his training. The tower once more cleared him for takeoff behind a C-124, with the same results. The Navy guy gave up on flying after that.