While living in Colombia, I once had a Rufous-tailed Hummingbird flying in the living room, checking out the flowers on the dining table, humming around for 5 seconds, and flying out the same window as he came!
Really good birds seen from a restaurant (mostly lodges) include:
Red-ruffed Fruitcrow @ Otun Quimbaya, C-Colombian Andes, while having breakfast.
Black-tipped Cotinga @ Canande, Ecuadorian Choco, while having lunch
Hombron's Kingfisher @ Delmonte lodge, Philippines while having breakfast.
Black-and-chestnut Eagle @ El dorado, Santa Marta, while having lunch.
Santa Marta Screech-owl (HO) @ El dorado, while having dinner.
Long-tailed Potoo @ Amazon manu lodge while having dinner.
Andean Cock-of-the-rock @ Manu paradise lodge while having lunch.
Lyre-tailed Nightjar @ Apalla, Satipo road while having dinner.
White-crested Laughingthrush @ Forktail creek camp, India, while having breakfast.
Many hummingbirds in S-America...
in Europe:
Corn Crake keeping me awake all night while camping, Belarus This was also the place where we had dinner... We decided to camp there and to lure the bird in with tape. Wrong idea! Never had an angry bird keeping me awake all night, probably calling from within touching distance of our tents!