This conflict is mostly due to Dave's repulsive ways and stench; it is also sometimes caused by Dave's clumsiness, which usually causes him to fall on Mody. This is a one-sided conflict on Mody's side as Dave doesn't intentionally mean to gross out Mody or hurt him.
The conflict started when Dave first arrived at campus. When Dave stepped off the bus he tripped and his armpit landed on Mody's face. Dave however apologized saying that he hasn't showered in three and a half months, causing Mody to vomit. When Chris announces that there will be dorm rooms, Mody looks at Dave (who discovered a cockroach in his underarm) and crosses his fingers that they won't be roommates.
Dave gets Mody to go with him the forest as an apology for the previous chapter, though Mody is still not fond of Dave, he agrees. Whilst in the forest, Dave disgusts Mody with conversation until he is eaten by a frog. Mody runs away. The two are put on the same team afterwards.