Our company fought a copyright infringement lawsuit a few years ago. It was frivolous from the start but it still cost us 1 million dollars and change to win, plus it consumed 2 whole years and lead to my boss's death from the stress. Hearing the judge ream the opponent for all the BS he put us through was gratifying, but we still were out a million dollars.
Don't even think of infringing on somebody's trademark. This thread would come in as evidence and you''d get hammered because you were aware of the situation and did it anyway. I don't know what happened to the Thirsty Monk, but I'm sure it was unpleasant and costly.