For starters, they're both awesome.
I've always thought of myself as a pretty well-rounded person. My dad might disagree and point out that 95 % of the movies I watch involve teenagers getting sliced in half, beheaded, or blown up. But aside from movies (and even my taste in those has expanded rapidly over the past few months), I actually have a bizarrely broad range of interests. Then again, maybe it's not so bizarre -- I bet there are plenty of people out there who love classic 90's sitcoms and boy bands. And while these two things seem worlds apart...well, they're really not.
1. They both involve brothers. Well, duh. Frasier and Niles are brothers, just like Joe, Nick, and Kevin are brothers. Both groups of brothers spend a bit more time together than the average brothers (though I've never had brothers, so this is just a guess). And both are great examples of brotherly and familial love.
2. They both deal with the terrible feeling of wanting someone you can't have. For months and years, even up to this day, hundreds of thousands of teenage girls (among others) have squealed and giggled and lusted over the Jonases. For some, it goes beyond the average celebrity crush. A few weeks ago, I blogged about how important it is for artists to make an emotional connection with their audience, and they've done this perfectly -- people feel as if they actually know them. And on the road from youth to adulthood, when a girl realizes that her fantasy crush is just going to have to stay a fantasy, it can be a tough pill to swallow.
But unrequited love is something even adults go through. Year after year on Frasier, Niles lusts after Daphne, his father's physical therapist turned housekeeper. Upon their first meeting, he is trapped in an unhealthy marriage, and by the time he separates from his wife and feels ready to date again, Daphne is already engaged. Niles does many crazy things in the name of lust, but ultimately chooses to move on and let Daphne be happy. And they end up getting together anyway! So having an unrequited or even fantasy crush come crashing down isn't necessarily the end of the world.
3. They've worked together. Well, two of them anyway. Jane Leeves, who played Daphne on Frasier, is now on Hot in Cleveland. Joe Jonas has guest starred on the show twice; the first time, his character hit on hers. Fortunately (unfortunately?), David Hyde Pierce wasn't there to step in.