Pippin's Sixth Sense

[akhtene]

Yeah, Pippin does seem quite different from his other companions.
In the book (the most part of it anyway) Pippin is the only one who enjoys the luxury of being just himself. Unlike him, other hobbits have tasks to do or roles to play. To say nothing of Frodo and Sam, even Merry is in the position of an older friend who wouldn't risk losing face.
Pippin isn't burdened with anything or attached to anyone. (I mean before he entered into Denethor's service. That started his 'growing up') All his wits and senses are open to the world. Of course, in his innocense and curiosity, he is drawn by everything unusual and magical. And his reactions are absolutely spontaneous. Isn't that normal hobbit behaviour? Remember Bilbo who had also acted mostly on impulse, when not watched by neighbours or worried by his property.
As Kalimac stated

it does seem like the veil between the ordinary and the supernatural is much thinner for Pippin than it is for the other hobbits

but, imho, only because his mind is not really troubled by anything