What is the Worst Song of All-Time?

All three of my computers are in the shop with viruses right now, so I have no access to my sports databases at the moment. So I thought I'd mix things up a little bit...

Yesterday, I was listening to the radio and The Boomtown Rats' "I Don't Like Mondays" came on. I don't think I'd heard it before, but I immediately thought it was possibly the worst song I've ever heard in my life. For those of you who don't remember The Boomtown Rats, they had Bob Geldof on vocals, and "I Don't Like Mondays" was a #1 hit for them in England in 1979.

As regular readers of my blog know, I love looking at performance extremes, and what could be more extreme than producing terrible music? I polled a few friends and got some more suggestions for the worst songs of all-time:

• I Don't Like Mondays, The Boomtown Rats, 1979 - #1 UK, #4 Canada, but just #73 in the US
  
• We Built This City, Starship, 1985 - #1 on US Billboard Top 100
• One Night in Bangkok, Murray Head, 1984 - #3 in the US
• Say You, Say Me, Lionel Ritchie, 1985 - #1 in the US
• Seasons in the Sun, Terry Jacks, 1974 - #1 in the US
• First We Take Manhattan, Leonard Cohen, 1988
• Afternoon Delight, Starland Vocal Band, 1976 - #1 in the US (Anchorman version)
  
• To Cut a Long Story Short, Spandau Ballet, 1980 - British Top 5
• Ideal Woman, William Shatner, 2004 - Album was #22 in US
  

So which of these sucks the most? Any other picks for the list?