So me and my friend logged on to this world... then a series of glitches happened in several days. I promise we did not do these.
1. Random Dragon's Breath spawned in mid-air. This summoned the purple particles identical to the one in the End when the dragon attacks. This did damage and it said "Bob was killed by Area Effect Cloud"
2. My friend's rails started glitching strangely
3. My stonecutter turned sideways when it was facing forwards.
4. My grindstone was right-side up but it turned upside-down.
5. My chests glitched.
6. My barrel started changing its rotation.
7. My banners turned backwards
8. My bed glitched.

My friend fixed most of these with a Debug Stick but not all of them. On another server, random lit TNT dropped from the sky and I swear there wasn't any form of command block or
any redstone machine in the sky. P.S Not all of the glitches are pictured.