Board Thread:Off Topic/@comment-27082610-20170624011641/@comment-24534644-20170708213649

Lol you got edit sniped, Someone. Sorry.

This is something played straight in X-Men, I believe. One of the mutants, Shadowcat, has the ability to turn intangible, but when she does so she explicitly says she needs to focus on keeping herself anchored to a surface or else she'll fall through it. She does this sometimes in buildings or caves to escape enemies or move faster, but if she just lets herself keep falling she'll eventually hit the center of the Earth (in fact, I think she did that once to take out a big bad).