Depends on the gig. If it's an older crowd we'll ease in with a couple of Don Williams things, "Love Me Tonight" segued into "I Would Like To See You Again" (there's a hint in the titles
).
But sometimes, if it's a pub gig with mixed ages, we'll start off with the intro to "Get Back", extended a bit to build it up, and just at the crucial moment sing "I Can See Clearly Now" in that style instead, before following on into "Get Back" itself. Never fails!
On sixties tribute jobs we'll invariably kick off with "Every Time That You Walk In The Room", stopping to let the audience sing the punch-line.