One of the new highlights of each football season is the Bad Lip Reading YouTube videos. Some folks take footage of NFL players saying things, and dubs them with completely unrelated words and phrases. It covers virtually every team, and is always so randomly funny.
I recommend watching the whole video above, but if you just want to watch the 49ers involved in the video, check out Jim Tomsula at the 14 second mark, and Blaine Gabbert at the 2:47 mark. My favorite non-49er segment is probably Drew Brees breaking down the Saints huddle with pig sounds.