Sing: 

I can see what's happening
and they don't have A clue 

they'll fall in love and here's the bottom line 

our trio's down to two

Oh ze sweet caress of twilight 

there's magic everywhere 

and with all this romantic atmosphere

Disaster's in the air

Sing:

And if he falls in love tonight

 it can be assumed

 in short our pal is doomed