Stagger is also a verb, as in to cause staggering. Specifically to cause doubt in one's own view and to leave one reeling in disbelief. Literally: that persons sheer stupidity (as demonstrated through their inability to detect sarcasm) is of such magnitude that I am starting to doubt the world around me, as previously my world view did not include people of such low intellect. The cognitive dissonance between that world view and this one has left me spinning and powerless to resist.
Hope this helps. Additional language lessons are available for the low low price of $1.99.