Almost always, cycling is the best choice of transport. Very occasionally though, it is most definitely not.
I have discovered that when you are meeting someone for a Valentines' breakfast, and you are specially wearing, instead of the usual cycling gear, a pretty (wool) dress, tights, scarf, socks, boots, a very unbreathable and highly unreflective coat and slightly more make up than usual, cycling might still, possibly be the right choice. If you cycle slowly. This will, however, be complicated if 1) you are late, or 2) it is a beautiful sunny day which makes you want to go as fast as humanly possible. If these two circumstances combine you are absolutely guaranteed to arrive on said date with a bright red face, sweating profusely, and take half an hour sitting in a well heated restaurant to cool down. You may in fact need to mop your face with your napkin.
Sorry Trusty, thou art forever by my side, but next romantic rendezvous with the other man in my life, you're staying at home.