My favorite is the "sweeping lane change" on the freeway, when they're driving at 65 in the fast lane in a minivan, realize they need to get off at the next exit, and cross all 4 lanes in one motion. Blinkers are optional.
The worst spot for this is southbound I-15 just north of SLC, right by the Beck Street/I-215 offramps. I can't count how many times I've almost died there...
