I did locate this in a SQL error log starting a day or two ago:
- You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-40, 21' at line 14


Tue, May 06 2014 05:13:42 -0500
Script: /home/XX/XX/XXXXXXX/web/forums/scripts/postlist.inc.php - Line: 511
select t1.TOPIC_ID,t1.POST_ID,t2.USER_DISPLAY_NAME,t1.TOPIC_CREATED_TIME,t1.TOPIC_LAST_REPLY_TIME,t1.TOPIC_SUBJECT,
t1.TOPIC_STATUS,t1.TOPIC_IS_APPROVED,t1.TOPIC_ICON,t1.TOPIC_VIEWS,t1.TOPIC_REPLIES,t1.TOPIC_TOTAL_RATES,
t1.TOPIC_RATING,t3.USER_NAME_COLOR,t2.USER_MEMBERSHIP_LEVEL,t1.USER_ID,t1.TOPIC_IS_STICKY,t1.TOPIC_LAST_POSTER_ID,
t1.TOPIC_LAST_POSTER_NAME,t1.TOPIC_LAST_POST_ID,t1.TOPIC_IS_EVENT,t1.TOPIC_HAS_FILE,t1.TOPIC_HAS_POLL,t1.TOPIC_POSTER_NAME,t1.TOPIC_THUMBNAIL,t4.POST_BODY,t3.USER_GROUP_IMAGES
from ubbt_TOPICS as t1
left join ubbt_USERS as t2 on t1.USER_ID = t2.USER_ID
left join ubbt_USER_PROFILE as t3 on t1.USER_ID = t3.USER_ID
left join ubbt_POSTS as t4 on t1.POST_ID = t4.POST_ID
where t1.FORUM_ID = 1
and t1.TOPIC_IS_STICKY = '0'

AND t1.TOPIC_IS_APPROVED = '1'
ORDER BY t1.TOPIC_LAST_REPLY_TIME desc
LIMIT -40, 21
- You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-40, 21' at line 14


And a bunch of these too:

Script: - Line: Unable to connect to the database! - Too many connections

I still have to review the really big SQL error file form today.