Board Thread:Off Topic/@comment-30759860-20180106034104/@comment-26877467-20180430015228

But what if... there's just as much antimatter as there is matter in the universe?

So the block's mass is zero!

A-hA!

(ignoring the fact that antimatter and matter both have positive mass)

The next person has been inflicted with a slow-acting poison and will drop dead in 24 hours.