Right-wing Labour MP Tom Harris posted the above image on his blog last night.
It's apparently a satire on the NEC's hypocritical decision to let Ken Livingstone off the hook last week.
But the thing about jokes is they're only funny if there's an element of truth in them.
And the truth is that there are those on the right of the party who would be far more relaxed about four more years of Boris than four more years of Ken.
Oona King's campaign (memorably described as a "boot camp for young Blairites") was always far more at ease attacking Ken than Boris.
Just as many Blairites now seem far more comfortable attacking Ed Miliband than David Cameron.
Chief among Labour's "Stop Ken 2012" campaign is London MP and Oona supporter Jim Fitzpatrick.
Fitzpatrick was instrumental in stitching up the 2000 mayoral selection against Ken Livingstone and installing Frank Dobson (who came third).
He was also at the forefront of booting out Labour's Mayoral candidate in Tower Hamlets Lutfur Rahman and replacing him with Helal Abbas (who came a distant second).
Now Fitzpatrick wants to make it a hattrick by kicking out Ken Livingstone who is neck and neck with Boris and replacing him with some other dud.
That now looks incredibly unlikely.
However at the very least the Labour right will spend the next year and a half doing all they can to undermine the Labour candidate and by default hand the election to the opposition.
Which is exactly what they're attacking Ken for.
Of course Tom's "satire" this morning would carry slightly more weight if he hadn't himself once openly and non-satirically campaigned for another Tory candidate:
But then I guess such high-minded principles can be very flexible things.