From time.c, line 23222:

/* This is a kludge. Let's just hope those bastards never actually reach* the speed of light. */

obj.time += 1/(1+obj.v**2 / c**2);

From math.c, line 132307:

int largest_prime_number () {
 /* Simple, but elegant. This one should be obvious. */
 ...
};

From physics.c, line 1299:

/* Hopefully, nobody'll catch on to this bit. If they do, I'll
 * have to recompile the whole blasted thing from scratch.
 * Maybe giant talking ants this time. */

if (photoncount == 1 && option == O_SLITCHOICE)
 interference();

From human.c, line 90221:

/* Yeesh. Yet another example of why I shouldn't be coding
 * when I'm drunk. */

From light.c, line 38494:

/* This ought to lead to some great fun later, eh? 
 * Hope nobody makes a portable one... */

if (reflect_surface_count == INT_MAX)
  set_laser(LT);

From biology.c, line 23323:

/* I'll have a look at this in the morning. *
 * Maybe mix up thirty new amino acids...        */

dna_codes = { 'AGC', 'TGC', 'ACT' ... };

From gen_science.c, line 24:

/* There is no WAY this will compile on Linux. */

From main.c, line 84992:

/* FIXME: Add meaning */


* Yes, God can italicize his comments. He's God.