Heh, although I advocate the use of an antivirus as the first line of defense, I think I catch about 20 virus in 10 years, most of them caused by my own lack of sense at the time.
The two last ones were one trojan hidden in a "picture" than a random guy send me over IM, avast! promptly warned me about it. Later I examined the file, and it turns out it was not even a picture, but a executable, maybe a embedded presentation, but I decided to shred it.
About virus, I had tons of boot viruses (the same every time, though) in my floppy disks during the years, after visits to internet cafes whose owners forgot to do the basic homework.