Not quite.

My son wanted to tell me about a gag from an Animaniacs cartoon.

"And there was this poster on the wall, and he was pointing -- a poster of -- you know -- um -- you know Uncle Tom, mom?"

Me, nonplussed:  "Uh -- like the book Uncle Tom's Cabin?"

"No, not a book -- you know -- the symbol of the United States?  Of the Army and stuff?"

I stared a moment before it connected.

"That's Uncle Sam."

"Oh, yeah.  Well, anyway, there was this poster on the wall --"

"U for Uncle.  S for Sam."

"Oh yeah."  Sheepishly.  "I remember now."

"Please try not to forget it."

Comments

[Amy F]

Wow, did Uncle Sam actually come from U.S. or was that your idea? I like it!

[Jamie]

You know, they're actually quite similar phonetically: they both start with a voiceless alveolar obstruent and their vowels are neighbors, acoustically speaking. :-)