This is one of those things, watch it too late at night or in an altered state, and the next day you won't be sure it wasn't a dream. This lengthy closing segment of an Otto Preminger film "Skidoo" gets increasingly surreal, in a 1968 pop culture way. It's all about LSD. Groucho Marx is God. And in the closing scene he's smoking a doobie. Really.

Here's the summary that caught my eye: One of Tony's(Gleason) cellmates turns out to be a draft dodger called Fred the Professor (Pendleton); an electonics wizard who has renounced technology.... He writes his wife with news, on stationery borrowed from Fred, and ignores Fred's pleas not to lick the envelope. When he does, he discovers the hard way that all the stationery is soaked with LSD... enough to send the whole prison on a hard trip. Fred guides Tony through the resulting acid experience, helping him come to terms with his worries about Darlene and his past, and plotting their escape.

Darlene and Stash spend the night aboard God's yacht, with Stash getting word back to Flo and his friends about their location, and a coded plea for help. As the hippies mount a rescue, Tony and Fred build a makeshift balloon from discarded freezer bags and garbage cans, dump the whole supply of stationery into the prison's lunch, and fly out of the prison as everyone below begins to freak out.

As it happens, both the hippies (led by Flo, who sings the title number as they storm the yacht) and the balloon arrive at God's hideaway at the same time. As they hunt him down, God abandons ship. Tony and Flo borrow a cabin on the yacht and renew their relationship, while Angie marries Elizabeth, and Stash and Darlene take their own hippie vows. God and Fred sail off together to pursue a simpler life.
- courtesy Wikipedia

Be sure to watch at least the credits, which are entirely sung by Nilssen.

Carol Channing always adds an air of the surreal, or at least "wtf?!", but I did not expect to see Groucho Marx smoking a doobie. The cast is a dizzying potpourri of everyone who's anyone, a la "Mad,Mad World". Jackie Gleason and Carol Channing, Cesar Romero and Frankie Avalon, Peter Lawford, Burgess Meredith, Groucho Marx, Harry Nilssen