I know we aren't suposed to post glitches but this one is actually pretty funny. All you need to do is:
1. Select the axe (3)
2. Start destroying a stone block
3. Immediately switch to (2) while still holding left mouse button
4. If you did it just right the block will be indestructible and change to different blocks
5. If you can't get it to work then rapidly alternate between 2 and 3 while breaking stone blocks, once you see it change hit 2 and stop. (while still holding left mouse button)
normally the block disappears after x amount of time
1 2 3 4 5 6 7 8 9 10 < 10 is when the block disappear
the axe makes it go faster, it stops at like 4
if u use a normal block (normal speed) get over 4 then switch to axe
u jump over the check of having axe and 4 at the same time
so it goes:
1 2 3 4
*switch to axe*
5 6 7 8 9 10
at 4 it checks if u got the axe, u don't.
at 10 it checks if u got any item but the axe. so it glitches up
1. Select the axe (3)
2. Start destroying a stone block
3. Immediately switch to (2) while still holding left mouse button
4. If you did it just right the block will be indestructible and change to different blocks
5. If you can't get it to work then rapidly alternate between 2 and 3 while breaking stone blocks, once you see it change hit 2 and stop. (while still holding left mouse button)
Screenshots don't do it much justice but:
You get a disapproving stare that i googled.
viewtopic.php?id=5597
viewtopic.php?id=5563
and most likely explanation.