It depends on how big the umbrella is. Some are large enough to cover two people without them even touching each other. (A pocket umbrella, on the other hand, I’d only share if the other person is someone I’m OK with hugging, or if it’s raining so hard that getting wet would be even more uncomfortable.)
I wouldn’t share an umbrella even with someone I’m perfectly comfortable intersecting space with. It’s hard and awkward and you get rained on anyway.
Well the trick is, the offerer holds the umbrella over the recipient’s head and gets wet.
It depends on how big the umbrella is. Some are large enough to cover two people without them even touching each other. (A pocket umbrella, on the other hand, I’d only share if the other person is someone I’m OK with hugging, or if it’s raining so hard that getting wet would be even more uncomfortable.)