Most everyone is excited to see Jimmy Fallon return to host "Saturday Night Live"
for the first time tonight, and if his promos with Fred Armisen
are any indication, it's going to be hilarious. While we're plenty psyched to see Fallon on "SNL" again, we thought it was also a good time to take a look at Armisen's funniest impressions over the years, just like we showed you with Kristen Wiig
last week.From Barack Obama to Joy Behar to Paul ...