LOL. I haven't done it often but yes I have done it enough that there is a mallet that stays in my craft/sewing room! (It does get used for other crafts too.) Canvas and denim are the main culprits.
Seriously?
You guys actually pound your seams? I wouldn't have thought to do that in a million years, but it makes sense.
With the boys' bags I made recently, I can't tell you how many needles I went through. I wish I would've known to get out the hammer...