He is shown to be the most caring of all six members in various instances on the show, but also shown to be the most neurotic and his insecurities often gets him in trouble.
Ursula tells Phoebe that she is bored with Joey and claims that he is smart enough to figure this out on his own without her having to actually tell him, so Phoebe pretends to be her sister to let Joey down gently.
Elizabeth then angrily throws a water ballon from her apartment hitting Ross square in the head, drenching him.