Might be ok if he were drinking Brains Bitter. If he were drinking Skull Attack, that might make a person jump.
“Here, hold my Brains” sounds more appropriate.
In the past, I was known to drink too many beers. So many that in the morning, I often had a ‘skull attack’. I usually drank ‘Molson Export Ale’ because it was easy to order, if I had an issue speaking or it was too loud to be heard at the hall. Simply make an ‘X’ with your index fingers and they got the message. Drinking ‘Labatt’s Blue’ lager led to not just a ‘skull attack’ in the AM, but a violent and odiferous ‘gas attack’, one that was vile enough to gag a maggot!