88 (number)

In the late 2000s, Toshiko Sato's grandfather celebrated his 88th birthday, a joyous year for the Japanese. Before she got stranded in the Ritz dance hall in Cardiff in 1941, Tosh intended to celebrate the occasion by "[going] off to London to watch grown men throw rice". (TV: Captain Jack Harkness)

In invalid sources
To pass the time on one of their TARDIS flights, the Fifth Doctor called out "two fat ladies - 88" while playing bingo with Tegan Jovanka and Vislor Turlough. (NOTVALID: Doctor Who? 77)