The One With Chandler In A Box - S4-E8
Monica: Fine, judge all you want to, but [to Ross] married a lesbian, [to Rachel] left a man at the altar, [to Phoebe] fell in love with a gay ice dancer, [to Joey] threw a girl's wooden leg in a fire, [to Chandler] LIVING IN A BOX!
The One With The 'Cuffs - S4-E3
Joanna: What are you doing?
Chandler: I'm getting dressed.
Joanna: Why?
Chandler: Because when I go outside naked, people throw garbage at me.
The One With The Girl From Poughkeepsie - S4-E10
Rachel: No accountants. Oh, and no one from, like, "legal." I don't like guys with boring jobs.
Chandler: Oh, and Ross was like what, a lion tamer?
Answer: Usually by the seventh night of Hanukkah you don't know what to get the other person, and you will probably resort to getting the other person something insignificant. Chandler is basically saying that the pen is a stupid gift.