Which Rescue Ranger is Chip? Which crotchety old Muppet is Waldorf? Let's settle this once and for all.

1. Statler and Waldorf

Ornery Muppets: In this photo, Waldorf is on the left (your left).

2. Siegfried and Roy

Masters of the Impossible: Siegfried Fischbacher is on the left.

3. Chip and Dale

Rescue Rangers: Dale, with the red nose, is on the left.

4. Turner and Hooch

Buddy Cops: Hooch, the dog, is just barely on the left.

5. Ed and Larry

Minor West Wing Characters: Larry is on the left.

6. Ben and Jerry

Ice Cream Men: Jerry is on the left.

7. Tom and Jerry

Cartoon Cat and Mouse: Jerry is on the left.

8. Itchy and Scratchy

A Different Cartoon Cat and Mouse: Itchy, the mouse, is on the left.

9. Lewis and Clark

Westward Explorers: Meriwether Lewis is on the left.

10. Hall and Oates

American Musicians: Daryl Hall is on the left.

11. Chang and Eng

Prolific Conjoined Twins: Eng is on the left. (Remember, we mean "in the photo." Chang was on the twins' own left.)

12. Ax and Smash

Demolition: Smash is on the left.

13. Trinidad and Tobago

Islands: Trinidad is on the left. The big one.

14. Ren and Stimpy

Nicktoons: Stimpy is on the left.

15. Mary Kate and Ashley Olsen

Wealthy Former Child Stars: Ashley is on the left.

16. Laverne and Shirley

Shotz Brewery Employees: Laverne is on the left.

17. Phineas and Ferb

Disney Stepbrothers: Ferb Fletcher is on the left.

18. Tippecanoe and Tyler, Too

1840 Running Mates: William Henry Harrison, "The Hero of Tippecanoe," is on the left. Though I guess the "Tyler" part kind of gave that away.

19. Bo and Luke

Dukes of Hazzard: Luke is on the left.

20. Coy and Vance

Replacement Dukes: Vance is on the left.

21. Dick Sargent and Dick York

Darrin Stevenses: Dick York is on the left.

22. Bosc and Bartlett

Famous Pears: Bosc is on the left.
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I know I'm just scratching the surface. Keep this cheat sheet going in the comments.

Image credits: Statler and Waldorf (Muppet Wiki); Siegfried & Roy (Michael S. Yamashita/CORBIS); Ben and Jerry (Wikimedia/Dismas); Ax and Smash (Action Figure Pictures);Map image via Shutterstock; Olsen Twins (Wikimedia/David Shankbone); Coy and Vance (TV Time Warp);Pear images via Shutterstock;