dave -- sky diving
david -- knitting
dave stones -- trying not to look too dumb
david stones -- astronomy
d. stones -- making bombs
d stones -- knocking down pensioners
dave s. -- driving cars at 150mph
dave s -- swimming in the nude
david s. -- you work too hard to have hobbies
david s -- abusing animals
ds -- spying
d.s. -- between the hours of 12pm and 1pm on days with a W in them
that just about covers it