I wouldn't recommend running it on an active table, but testing it in a throwaway table is reasonably easy.
From the mysql commandline client (using mysql 4.0 )
mysql> create database pmtest;
Query OK, 1 row affected (0.09 sec)
mysql> use pmtest;
Database changed
mysql> create table t (id smallint, count smallint, time datetime);
+ Query OK, 0 rows affected (0.01 sec)
mysql> insert into t values (1,1,now());
Query OK, 1 row affected (0.00 sec)
mysql> insert into t values (2,1,now());
Query OK, 1 row affected (0.00 sec)
mysql> insert into t values (3,1,now());
Query OK, 1 row affected (0.00 sec)
mysql> update t set count=count+1, time=now() where id=2;
Query OK, 1 row affected (0.02 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update t set count=count+1, time=now() where id=2;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from t;
+------+-------+---------------------+
| id | count | time |
+------+-------+---------------------+
| 1 | 1 | 2007-02-22 19:26:39 |
| 2 | 3 | 2007-02-22 19:27:06 |
| 3 | 1 | 2007-02-22 19:26:45 |
+------+-------+---------------------+
3 rows in set (0.01 sec)
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