/give @p sign 1 0 {BlockEntityTag:{Text1:"{\"text\":\"Lightning Strike\",\"color\":\"dark_red\",\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/execute TheEllaCat ~ ~ ~ /summon lightning_bolt\"}}",Text2:"{\"text\":\" \",\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/setblock ~ ~ ~ air\"}}"},display:{Name:"Custom Sign"}}