What are some of the more popular questions on Stack Overflow that have been deleted?

This is an archive of popular deleted questions on Stack Overflow, mostly from the days when a broader range of questions were allowed. Also, they may be a poor question, but have really good answers.

Related:

An unofficial partial archive can be found here.

And another site with a deleted listing is here

I've split these up by categories like the Deleted Meta Questions Archive. Please feel free to improve them as you please.