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    26 Celebs That Prove Just About EVERYONE Has Been On "ER"

    Long before he was Ron Swanson, Nick Offerman was Rog.

    1. Zac Efron

    2. Ariel Winter

    3. Shia LaBeouf

    4. Eva Mendes

    5. Josh Radnor

    6. Chris Pine

    7. Rooney Mara

    8. Gabrielle Union

    9. Chadwick Boseman

    10. Lucy Liu

    11. Ewan McGregor

    12. Josh Hutcherson

    13. Adam Scott

    14. Kirsten Dunst

    15. Nick Offerman

    16. Kat Dennings

    17. Kristin Davis

    18. Tobin Bell

    19. Cara Buono

    20. John Hawkes

    21. Deborah Ann Woll

    22. Stana Katic

    23. Michael Cudlitz

    24. Eric Stonestreet

    25. Josh Peck

    26. Aaron Paul