I noticed that Buford Van Stomm from Phineas and Ferb wears a black tee shirt with short sleeves, and an approximation of a skull on the front
Is there any correlation with the skull image that Frank Castle wears on his shirt, in the role of The Punisher?
Also noted that Crash from The Bettys wears a tee shirt with a similar motif, but different colours.
Also Sid Philips from Toy Story (1995) wears a similar shirt.
Is there any connection between these?