The truth has finally dawned upon me after Mrs Rine summoned up the courage to confront me with it yesterday.
It's true. I burst into unexpected song the minute I hear someone utter key words which link to a distant part of my musical Cerebral Cortex and without really knowing it, I'm suddenly the Go-to Go Compare man of Norfolk.
For example, if the Postman says "This may have been returned from the sender" I will seamlessly come out with "She wrote upon it, ..." in my best Presley imitation. Another key word and I'm doing "Spanish Castle Magic (with wah wah effects)", "Concrete and Clay" or "Movin' on Up!" - it's all sounds pretty random.
It isn't just trigger words from the environment that set me off. Sometimes I can spend several minutes with a current earworm going round on my built-in Rockola Juke Box and suddenly, without warning, I'll translate that inner song into free vocal expression to the bewilderment of those around me. I haven't been escorted from Sainsburies yet but suspect it's only a question of time. (As I typed "question", I felt a "Question Mark and the Mysterions - 96 Tears" welling up. I'm getting worried now.)
The other day I was told that I should stop suddenly coming out with "Spice up Your Life!" after it had festered somewhere in my brain from the Olympic Closing Ceremony. We were in the Spice department of aforementioned Sainsburies so it could have been nature or nurture - I didn't realize at the thyme.
I'll see if I can get things under control but worry it may be genetic. I remember my father used to come out with sections of "Teddy Bears Picnic" at incongruous times (ie when we weren't having picnics with Teddy Bears).
"Everyday it's a-gettin' closerGoin' faster than a roller coaster...."