Affects Version/s: Minecraft 14w02a, Minecraft 14w02b
Fix Version/s: None
Environment:java 7 u21
your screen will bump up and down real quick and your grounded will say true-false-true-false... in your F3 menu.
your y coordinate stays the same though!
duplicate this glitch by:
1: set down a slime block
2: stand ontop it
3: hold shift and move to an edge.
4: now keep holding shift and move back to the middle of the slimeblock
5: open F3.