From Worms Knowledge Base
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The "Alien" glitch occurs when a worm horizontally hitting a wall at a nearly vertical angle steeper than 87.138° (slope=20) and a vertical speed past the fall damage threshold will stop and twang as if it hit the ground, but will then continue to fall. If the worm fell from a rope dismount, it will not lose control of its turn.
W:A Beta versions since 220.127.116.11 log instances of the "alien" glitch (with the "Export Log" feature).