They can be great if you love the song, annoying if you can't remember the song title or artist but a complete pain if it's the lyrics of a song you can't stand.
I couldn't sleep at all last night. I was awake for hours and my earworm was 'Up all night to get lucky, up all night to get lucky, up all night to get lucky...' multiplied by 1,000,000,000,000.
It's my own fault, I know, but I've had all of the posted earworms at some stage today. Whoever said 'variety is the spice of life' didn't have a brain so susceptible to absorbing annoying hooks!
The one I have now is the 'Lovely day, lovely day...
Thanks Bill Withers.