Most annoying song, period.

Sorry if I'm replicating a thread.    I've been wanting to say this for years:  Rick Astley - Never gonna give you up.  What's yours?
"How Do You Do" by Mouth and MacNeal (?) - and then we can, na na, na na...
“ Long tall glasses” You know I can’t dance... By Leo Sayer. Pretty much any song by Leo Sayer.
Kinda cheating here - sorry, but can't resist a 4 part reply. Paul McCartney - "Wonderful Christmas Time", "Yes I'm Ready" by Barbara Mason, and ANYTHING by Taylor Swift or Rascal Flatts.
William Shatner - "Lucy In The Sky With Diamonds"

Horribly BAD!

Journey- “Don’t Stop Believin’”