January 30, 2015 9:46 AM EST

Last Week Tonight host John Oliver appeared on the Late Show with David Letterman and discussed how far he’d go to make people laugh — including injure himself.

The 37-year-old comedian told Letterman that during a USO Tour to Afghanistan in August, 2013, Oliver had just finished performing a set for the troops when a soldier asked if he’d tase himself. Oliver, looking for a laugh, agreed.

The visit marked the first USO tour for Oliver, who was touched by the trip as his wife is a former Army combat medic, who deployed to Iraq.

The next season of Last Week Tonight is slated to return to HBO on Feb. 8.

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