A series of interesting glitches made in audacity
Short discrete error sounds, could be used for game sounds.
Digital clock error through S/PDIF port of M-Audio 1814 sound card. Very common.
Connecting to Internet via modem ála 90's !
Sound of a forest with singing birds; you can loop it
Train approaching quickly at 50 mph, whitsle blowing, has cool sound of whistle passing by, I continue to record the ...
A really fake sounding scream, made by shouting into my hat, recorded with my computer mic.
A smaller group of 2 zombies