Here's a randomly filled in NCAA Men's Basketball Tournament bracket. If you don't like this one, press reload for another. It's currently set to use the initial pairings for the 2018 tournament. Each game is chosen randomly as follows: if the two teams involved are seeded 'x' and 'y', then Pupset = min(x,y) / (x+y). (See note.)
FINAL FOUR
=================
+-( 1)-Virginia-----+
+-( 1)-Virginia-----+
+-( 4)-Gonzaga------+ |
+-( 1)-Virginia-----+
+-( 2)-Purdue-------+ |
+-( 2)-Purdue-------+
+-( 2)-Duke---------+
South Regional
=================
+-( 1)-Virginia-----+
+-( 1)-Virginia-----+
+-(16)-UMBC---------+ |
+-( 1)-Virginia-----+
+-( 8)-Creighton----+ | |
+-( 9)-Kansas St.---+ |
+-( 9)-Kansas St.---+ |
+-( 1)-Virginia-----+
+-( 5)-Kentucky-----+ | |
+-( 5)-Kentucky-----+ | |
+-(12)-Davidson-----+ | | |
+-( 4)-Arizona------+ |
+-( 4)-Arizona------+ | |
+-( 4)-Arizona------+ |
+-(13)-Buffalo------+ |
+-( 1)-Virginia-----+
+-( 6)-Miama (Fla.)-+ |
+-( 6)-Miama (Fla.)-+ |
+-(11)-Loyola-Chi.--+ | |
+-( 3)-Tennessee----+ |
+-( 3)-Tennessee----+ | | |
+-( 3)-Tennessee----+ | |
+-(14)-Wright St.---+ | |
+-( 3)-Tennessee----+
+-( 7)-Nevada-------+ |
+-( 7)-Nevada-------+ |
+-(10)-Texas--------+ | |
+-( 2)-Cincinnati---+
+-( 2)-Cincinnati---+ |
+-( 2)-Cincinnati---+
+-(15)-Georgia St.--+
West Regional
=================
+-( 1)-Xavier-------+
+-(16)-NCCU/TXSO----+
+-(16)-NCCU/TXSO----+ |
+-( 8)-Missouri-----+
+-( 8)-Missouri-----+ | |
+-( 8)-Missouri-----+ |
+-( 9)-Florida St.--+ |
+-( 4)-Gonzaga------+
+-( 5)-Ohio St.-----+ | |
+-( 5)-Ohio St.-----+ | |
+-(12)-S. Dak. St.--+ | | |
+-( 4)-Gonzaga------+ |
+-( 4)-Gonzaga------+ | |
+-( 4)-Gonzaga------+ |
+-(13)-UNC-Green.---+ |
+-( 4)-Gonzaga------+
+-( 6)-Houston------+ |
+-( 6)-Houston------+ |
+-(11)-San Diego St.+ | |
+-( 3)-Michigan-----+ |
+-( 3)-Michigan-----+ | | |
+-( 3)-Michigan-----+ | |
+-(14)-Montana------+ | |
+-( 2)-N. Carolina--+
+-( 7)-Texas A&M----+ |
+-( 7)-Texas A&M----+ |
+-(10)-Providence---+ | |
+-( 2)-N. Carolina--+
+-( 2)-N. Carolina--+ |
+-( 2)-N. Carolina--+
+-(15)-Lipscomb-----+
East Regional
=================
+-( 1)-Villanova----+
+-( 1)-Villanova----+
+-(16)-LIU/RAD------+ |
+-( 1)-Villanova----+
+-( 8)-Va. Tech-----+ | |
+-( 8)-Va. Tech-----+ |
+-( 9)-Alabama------+ |
+-( 1)-Villanova----+
+-( 5)-W. Virginia--+ | |
+-( 5)-W. Virginia--+ | |
+-(12)-Murray St.---+ | | |
+-( 4)-Wichita St.--+ |
+-( 4)-Wichita St.--+ | |
+-( 4)-Wichita St.--+ |
+-(13)-Marshall-----+ |
+-( 2)-Purdue-------+
+-( 6)-Florida------+ |
+-(11)-STBON/UCLA---+ |
+-(11)-STBON/UCLA---+ | |
+-( 3)-Texas Tech---+ |
+-( 3)-Texas Tech---+ | | |
+-( 3)-Texas Tech---+ | |
+-(14)-SF Austin----+ | |
+-( 2)-Purdue-------+
+-( 7)-Arkansas-----+ |
+-( 7)-Arkansas-----+ |
+-(10)-Butler-------+ | |
+-( 2)-Purdue-------+
+-( 2)-Purdue-------+ |
+-( 2)-Purdue-------+
+-(15)-CSFullerton--+
Midwest Regional
=================
+-( 1)-Kansas-------+
+-( 1)-Kansas-------+
+-(16)-Penn---------+ |
+-( 1)-Kansas-------+
+-( 8)-Seton Hall---+ | |
+-( 8)-Seton Hall---+ |
+-( 9)-NC State-----+ |
+-( 1)-Kansas-------+
+-( 5)-Clemson------+ | |
+-( 5)-Clemson------+ | |
+-(12)-New Mex. St.-+ | | |
+-( 5)-Clemson------+ |
+-( 4)-Auburn-------+ | |
+-( 4)-Auburn-------+ |
+-(13)-Charleston---+ |
+-( 2)-Duke---------+
+-( 6)-TCU----------+ |
+-( 6)-TCU----------+ |
+-(11)-ASU/SYR------+ | |
+-( 6)-TCU----------+ |
+-( 3)-Michigan St.-+ | | |
+-( 3)-Michigan St.-+ | |
+-(14)-Bucknell-----+ | |
+-( 2)-Duke---------+
+-( 7)-Rhode Island-+ |
+-( 7)-Rhode Island-+ |
+-(10)-Oklahoma-----+ | |
+-( 2)-Duke---------+
+-( 2)-Duke---------+ |
+-( 2)-Duke---------+
+-(15)-Iona---------+