Never make a favourite song your ringtone. Otherwise when you listen to the song, or are just merrily listening to your iPod on shuffle and the song comes on, you start getting paranoid thinking it’s your phone. You may even start crazily rummaging through your handbag, frantically looking for a phone that isn’t actually ringing.
People may think this is strange. Especially on public transport.
And it also kinda ruins the song (in this case, the song is “I’m a Cuckoo” by Belle and Sebastian… quite apt really for someone who searches for her phone with imaginary incoming calls any time she hears a riff in a song that vaguely sounds similar). So stick with crazy frog or something and don’t ruin one of your favourite songs by making it your ringtone.
Just some advice. From me to you.