Season 6: Episode 18 - My Son's Enormous Head

My Son's Enormous Head: When Charlie’s girlfriend Chelsea comes down with the flu, his natural reaction is to send her home so he can avoid getting sick. However, trying to prove how much he loves her, Charlie asks Chelsea to stay over so he can take care of her. Charlie then suffers through all of the humiliating tasks involved with helping Chelsea get better, and eventually he ends up sick himself. Meanwhile, Alan tries to be supportive of Charlie and Jake deals with a nine year old that has a crush on him.