This wasn't in central Illinois, but sure was strange. Was fishing up in Canada with our group and we were trolling the same area, our boat going one way, theirs going opposite. My brother calls out "fish!" And all of a sudden we see a 16" walleye pop out of the water about 5' --and stay there! My brother and a friend in the other boat both caught the same walleye and it was a race back to see who could net it out of the air! Unfortunately they got there first. Never seen that before or since.