U2's Bono took some time off from making music to attend the 2013 Clinton Global Initiative on Tuesday...and was a big hit with an unplanned performance.

When it was announced that Bill Clinton would be late to the forum, Bono took the mic and launched into his best 'Slick Willie' impression, which is pretty darn good!

It was in the middle of Bono's 'performance' that the former President arrived. And how did he respond the the Irish rock icon's Arkansas twang? Take a look and see!