19 yr old, male, Maths&Physics student from UK. Lurked on OB, then started lurking here when this place was made. EDIT: In case you want data on abnormalities among lesswrong lurkers here's two: Raised in Colombia as the son of missionaries. Self-taught.
Writing to confirm. My own experience was very similar but the extreme disorientation lasted only about two minutes with minor disorientation for another five or so. Not recommended.