We all know the monster of argumentation that is Christian presuppositionalism. This thread is over a thousand posts.
If you don't want to read it, the participants were kind enough to summarise their positions in verse and rhyme.
The atheist claims he can know
But when asked how this is so
His response is so dense
For he claims 'reason and sense'
Whose validity he cannot show.
There once was a man named Sye
Who was really an irrational guy
He began with proof
Was withdraw and aloof
And it turned out it all was a big lie