Too close for comfort

Great minds? On September 1, I published this cartoon. And then a month an a half later, on October 15, two other cartoonists published these below. Interesting that they both published on the same day, what are the odds?

I hate when this happens. Too much similarities in comics, but I guess there are only so many subjects. Right?

I love how we all draw the Frankenstein monster, similar, but not.