I sometimes see this in soccer and I bet it almost every time.
Last place team that had won 1 of last 17 games and was listed as a slight favorite. Playing the 8th seeded team at home, a team that was averaging exactly 2 goals per game in it's last 6 games or whatever.
And to top it all off, the last place team had been held scoreless in 3 of their last 4 games.
Odds were -110/+100 more or less for a Pick Em.
Why do the linesmakers do this?