Guiness milk shake

[Zardoz]

Yes, half Guinness and half Champagne is a 'Black Velvet'. (although I've seen folks use cider)
A 'Black and Tan' is Guinness and Bass ale. - Use Harp Lager instead of Bass, and it's a 'Half and Half'.
Lately, Guinness have been promoting an 'All-Irish Black & Tan' made with Smithwick's Ale.

[Biathlonman]

I think I stand corrected Zardoz - it has been awhile. Black Velvet seems to be what it was called. Good too, if expensive when you're filling a big punch bowl.

[ABG0819]

Yes, half Guinness and half Champagne is a 'Black Velvet'. (although I've seen folks use cider)
A 'Black and Tan' is Guinness and Bass ale. - Use Harp Lager instead of Bass, and it's a 'Half and Half'.
Lately, Guinness have been promoting an 'All-Irish Black & Tan' made with Smithwick's Ale.

Thanks for the lesson on mixed beer drinks ... I've never been a fan of b&t but I love smithwicks ... I may have to try that one.