I loved this video (sorry, can't embed it): two brothers 'steal' their Dad's old 1969 Norton Commando 750 and have it fully restored for him in time for Christmas. It's a real beaut, and he didn't know a thing about it.
Great to watch if:
1. You are a sentimental old git, or
2. You like the look and sound of old British bikes.
Both will apply in some cases :)
H/t to Kenneth K of Norway, on the Triumph Rats Forum.