It's not surprising that two or more comic strips will happen upon the same theme in a daily sequence. After all, many react to current events, pop culture crazes, or just the current zeitgeist. What is unusual, though, is when two different comic strips -- on the same day -- reference a zeitgeist long past.
January 25, 2014 Mark Tartulli's Lio presented this one-panel gag. (click on images to enlarge)
And the same day Wumo, by Mikael Wulff and Anders Morgenthaler, had this single panel entry.
Both of these gags seem more in tune to 1967 than 2014. Odd that they should both show up on the same day (especially given their lead times).
I'm not complaining -- it just struck me as odd.
But there's something else to remember. Neither gag would have seen print in 1967. Their subject matter would have been considered too controversial for the comics pages of virtually all major newspapers.