All concrete collapsing, massive drops/increases in pressure that can shatter your eardrums, untreated metals cold welding, full UV rays going through an Ozone layer that no longer exists, planes fall out of the sky… oh and yeah the Earths mantle just fucking collapsing in on itself and essentially dissolving as its composition has an enormous amount of oxygen
Chances of all oxygen atoms(in air) suddenly gathering up on some corner of the mediterrian sea is not 0.
I always harbor a slight panic that all the laws of the universe we observe have, so far, been a massive coincidence. Everything is completely random and right up to this point they just happen to have been doing that.
At any moment it could all go absolutely Bursar.