Hunter Gillgan leads Ethan De Soto (wearing mask) during Friday’s annual Serpentine Parade, a homecoming tradition for Snohomish High School students. (Andy Bronson / The Herald)

Hayden DeYoung (40) ducked, but Nolan Harris stands, barely clearing wires while riding in a fire truck during the annual Serpentine Parade of Snohomish High School students on Friday in Snohomish. (Andy Bronson / The Herald)

Snohomish High School students slap hands with Central Elementary students during the annual Serpentine Parade on Friday. (Andy Bronson / The Herald)

Freshman Troy Pennamen sports three red-and-black spikes in his hair. He was among about 1,500 Snohomish High School students who walked in the annual Serpentine Parade in Snohomish on Friday. (Andy Bronson / The Herald)

Snohomish High School students walk in the annual Serpentine Parade in Snohomish on Friday. (Andy Bronson / The Herald)

English teacher Tim Fraser-Bumatay wears an Iron Man costume as he and Snohomish High School students walk in the annual Serpentine Parade on Friday, a tradition for generations of students. (Andy Bronson / The Herald)

Snohomish High School students walk down Fifth Street in the annual Serpentine Parade on Friday. (Andy Bronson / The Herald)

Some 1,500 Snohomish High School students walk in the annual Serpentine Parade on Friday in downtown Snohomish. (Andy Bronson / The Herald)

Residents watch more than 1,500 Snohomish High School students walk in the annual Serpentine Parade downtown on Friday. (Andy Bronson / The Herald)

A trio of Snohomish High School students take a selfie as they walk in Friday’s annual Serpentine Parade, a tradition for generations of students in Snohomish. (Andy Bronson / The Herald)