Cheech Marin and Tommy Chong, the iconic duo that helped define an era of counterculture/stoner humor in America, gained huge success in the '70s and '80s by way of nine hit albums and eight films, most notably the surprise box-office smash "Up In Smoke," which grossed $100 million.

After going separate ways in 1987, fans had to wait 13 years for their first taste of a Cheech & Chong [ tickets ] reunion; in 2000, the two did voices for an episode of the TV show South Park--although they recorded them separately. This year, they finally took the plunge, reuniting for their first stand-up tour together in 25 years. The "Light Up America" tour has been rolling since December, and is set to run into next year.

LiveDaily's Tim Mosenfelder attended their show at San Francisco's Nob Hill Masonic Auditorium on Sunday (11/23), and here are some of the photos he took.