INTP thinks about something intensely and completely forget his surroundings, while walking to work.

In workplace realizing he was still wearing his crocs

cringes, but still works trying to just forget the looks of people and then thinks again about something random intensely and search it on the PC where he works on

The thing he thought about the whole time, was a random mushroom in Bangladesh and how it evolved

(INTPs cognitive functions are Ti>Ne>Si>Fe)