Perhaps this makes me more giddy than it should. However...
David does a really great job in "Angel." The writing for this show is also pretty entertaining. It's very snarky and sarcastic. The storylines aren't always the best, and the monsters and demons and things are really fake-looking, but the character Angel makes up for everything! There are also other entertaining characters, but who can beat a soulful, brooding, sarcastic vampire?
Anyway, I've been a fan of "Bones" for about a year now. Jessica got me into it last year, and I watched the existing four seasons in two months, and then kept up with fifth season all last year. I love that show! One of the two main characters is David Boreanaz. He plays Special Agent Seeley Booth. So, of course I already knew that connection--it was pretty much why I picked up "Angel" in the first place. But, in a couple of season five episodes in "Angel," T.J. Thyne shows up! T.J. Thyne plays another main (or maybe minor?) character on "Bones." His sudden appearance just made me giggle. "Angel" really is bringing out a ton of connections to every show I watch. I mean, I don't even have to stretch anything!
There was the other obvious connection (obvious to me because I knew about it going into the show) was James Marsters. He plays the character Spike, but before I watched "Angel," I knew him as BrainIAC on "Smallville"'s fifth, sixth, and eighth seasons. He's really a great actor. Believe it or not, there are two more "Smallville" connections: Sam Witwer and Steven S. DeKnight. Sam only appeared in one episode, and it took me a few minutes to recognize him, but as soon as I put it together, I laughed. He was one of the main characters of season eight, Davis Bloom (Doomsday). Steven S. DeKnight, a producer and writer for "Angel," is a producer and writer for "Smallville" currently.
The first (besides David Boreanaz) connection I spotted was Tyler Christopher. He plays a character on "General Hospital." I'm not kidding--"Angel" is connecting everything, even my soap!
I giggled like a maniac when Jeffrey Dean Morgan popped up. He played John Winchester on "Supernatural" for a few episodes. He was a really key character, even though he didn't have a lot of screen time. One of the main writers for both shows is Ben Edlund.
Kal Penn was in two episodes! This guy played Dr. Kutner on a couple of seasons of "House, M. D." His character in "Angel" was a really weird psychic kind of guy that wore a fez to hide the fact that his brain bulged out of his head.
Daniel Dae Kim was in quite a few episodes. He was Jin (I think that was his name) on "Lost." "Lost" wasn't really one of my shows, but I still made the connection. I did watch part of the first season... :)
The only show of mine that I haven't made a connection to (yet) is "The Vampire Diaries." But, it's only been out for one season! And who knows? I've still got about 15 episodes left of "Angel." I could find a connection there, or somebody could pop up in "TVD." Or, maybe the connection of the brooding, animal blood-drinking vampires (Angel and Stefan) is going to have to be good enough. Haha.
Okay. Now for the weirdest connection ever. My favorite actor is Jensen Ackles, whom I discovered on "Smallville," and followed to "Supernatural" (which is also Jessica's fault). He's a fantastic actor, and a really great guy! And he's from Texas, which is a major plus in my book. Well, long story short, I found a video on youtube of him singing "Luchenbach, Texas" with some guy on stage. It was a really bad picture, but I could hear, and I could see well enough to tell that it was Jensen. I always thought that singer was great. Well, there's a guy named Christian Kane on "Angel" that plays a character named Lindsey McDonald. I never paid his character much attention until (basically) he started acting like a Texas boy. Then he sang on the show, and I decided to do a little research. He's also a singer (and is currently the guy with long hair on "Leverage," but I haven't gotten to that show yet), and among his youtube videos of him singing, there was one of him singing "Luchenbach, Texas" with none other than Jensen Ackles. Now is that a cool connection or what?
The acting world... I guess it's like Mormons. Everybody's connected, especially when you get them all into the same area.