Luke HelderLuke Helder
, a Wisconsin
college student and Minnesota
resident, earned notoriety as the midwestern pipe-bomber of May 2002. Helder tried to replicate a smiley
face in his pattern of pipe bombs. His bombs were found in Nebraska
. Helder was captured before he completed the smile itself. When arrested he was wearing a Nirvana
tee-shirt and had a smile on his face.