Mike speaks with Tanveer Ahmed, a psychiatrist and social commentator, about a US study that found people with more bumper stickers, especially political ones, have a stronger sense of "territoriality" regarding their cars.

This behavior, dubbed "ideological poking," often mocks opponents and leads to greater boundary confusion on public roads.

These drivers are more prone to road rage, displaying behaviors like tailgating, honking, and ramming, and are more likely to exhibit psychopathic traits, such as a lack of empathy.

Bumper stickers reflect the deep symbolism and personal identity tied to the cars we drive.

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