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Disastrous visit from Mrs. Hofstadter brings Leonard and Penny closer together.
Sheldon's "simple" solution to Penny's financial problem leads to a confrontation between Leonard and Penny's hulking ex-boyfriend, Kurt.
Paintball game leads to a fight between Penny and Sheldon, and romance for Wolowitz and Leslie.
Leonard and Penny's relationship takes a turn for the worse when they break up, but is quickly resolved. Soon their relationship progresses into a stronger friendship than before, while Sheldon and Penny's friendship slowly begins.
