The funniest bug i ran into was changing the spawn rate of the flies in my game to around 15 per second(I intended 1 every 15 seconds). The speed of the enemies are determined by the spawn rate so this made then insanely fast as well.
Each fly has a sound that plays so all of the sudden my game went from relatively calm sounds of bugs cruising into frame to this game crashing onslaught of high pitch noises screaming accross the stage. It actually made me laugh out loud.
It's working much better now: Blind as a Bat