–Research the origin of the expression “Bull dyke”. (It’s actually a fascinating story.)

–Discriminate between the terms “in stir” and “in the stir”.

–Research why, and exactly when, Germany switched to 24 hour clocks.

This is what I call fun: trawling slang dictionaries, the OED, other obscure books and databases. Is it any wonder Willow was my favorite Buffy the Vampire Slayer character?