I'm afraid to start down this road. I majored in astrophysics, so I remember things from:

• astronomy (3.26 light years in a parsec, 5400K surface temperature of the sun, 11 - years in sunspot cycle, only 15% of stars are in single-star systems, Chandrasekhar's limit of 1.44 solar masses for a white dwarf, etc),
• physics (Planck's constant, speed of light, gravitational constant, etc),
• chemistry (1.0038 ratio of rest masses for Neutron and Proton, Avagadro's number, etc),
• mathematics (pi is 3.14159265..., e is 2.718281828...),

and so on.

Then there's the sports geek stuff, some of it pretty obscure:

2 - most number of consecutive no-hitters by one pitcher (Johnny van der Meer)
176 - most points scored by an ABA team in a regular season game (Indiana Pacers, at Pittburgh Condors)
44 - Pete Rose's consecutive hit streak to set the National League record
755 - Hank Aaron's home run record
2 - number of people to win the Indy 500 and Daytona 500 (Mario Andretti (one each) and A.J. Foyt (4/2))

Gah! I can't stop! Shoot me now!