protesting outsid protesting the studio and came close to drowning him out. >> it's a tough city. we're hearing it outside. some protesters. >> a little serenade. >> the chant was liar, you see there, the new york city police union upset with de blasio claiming he is stalling on a new labor contract. there was laughter and tears during the series finale of the big bang theory. >> i want you to know in my way i love you all. >> the cbs sitcom ended its 12th season run thursday with a one hour finale that wrapped up several long story lines. it is the longest running multicamera series in television history. fans took to social media to praise the ending that wrapped things up nicely and did not kill anyone off.