"The less you know, the stupider..."

"Legal vodka has killed more people than illegal grafitti."

In blue: "Smile more often!"

In red: "Be unique: follow a cop!"

I think the idea behind the latter is that normally policemen follow you, so be unique and follow one of them.

"I love you"

"Hail, Billy!"

"Homophobia to the museum"

I think they mean that homophobia is so old-school that it belongs in a museum.