I have spent hours browsing throught the oldies-but-goodies comic strips at Barnacle Press.
They have an awesome collection of newspaper comics from the past hundred years or more, and are always adding more.
Some of them are obscure and you’ll delight in discovering them. Others are familiar — some still printing today — and you’ll be amazed at how long they’ve been around.
I warn you — if you go there, you may not get anything else done the rest of the day.