1. Oh, well, that's to be expected in our adversarial system. Truth wins out. No harm, no foul.
2. A stern warning to the "jerk" to "knock it off" or face sanctions.
3. Immediate sanctions with no warning. This is generally frowned upon by MN appellate courts under our rules.
Likewise, obnoxious, uncooperative behavior by a party not represented by an attorney may result in sanctions including a default judgment or award of attorney's fees against them.